Wallace has been diagnosed with a torn labrum in his left shoulder and will require surgery, Shams Charania of ESPN reports.
Although Wallace's return timetable has yet to be determined, Charania notes the guard is expected miss most of, if not all, of the rest of the season. It's been a brutal day for the Thunder, who also lost Jalen Williams (ankle) on Monday and will need Ajay Mitchell, Jared McCain and Alex Caruso each to step up for the foreseeable future.
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Thunder's Cason Wallace: Out with sore shoulder
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Wallace (shoulder) is out for Monday's game versus the Suns.
The injury is being labeled as shoulder soreness for Wallace, who left Sunday's game against the Clippers early. Jared McCain and Ajay Mitchell figure to see expanded roles with Wallace out, while Alex Caruso is also in the mix for more playing time.
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Thunder's Cason Wallace: Won't return Sunday
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Wallace (shoulder) will not return to Sunday's game against the Clippers, Rylan Stiles of SI.com reports.
Wallace exited for the locker room with an apparent left shoulder injury during the first quarter and will not be able to return. Jared McCain and Ajay Mitchell figure to see expanded roles with Wallace out. The Thunder play the second half of their back-to-back set Monday against the Suns, so it wouldn't be surprising for Wallace to miss time.
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Thunder's Cason Wallace: Headed to locker room
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Wallace went back to the locker room with an apparent shoulder injury during Sunday's game against the Clippers, Justin Martinez of The Oklahoman
Wallace drew an offensive foul on Isaiah Jackson and immediately went back to the locker room. He should be considered questionable to return.
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Thunder's Cason Wallace: Goes cold from deep
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Wallace finished Tuesday's 116-104 victory over the Spurs with six points (3-8 FG, 0-4 3Pt), three rebounds, two assists and one steal over 19 minutes.
Wallace started alongside Shai Gilgeous-Alexander but failed to convert any of his four attempts from beyond the arc. Meanwhile, reserve guard Jared McCain erupted for 20 points and six three-pointers in 22 minutes, outscoring Wallace despite coming off the bench. Wallace's defensive contributions should keep him involved, but competition for backcourt minutes could make his offensive production inconsistent.
Wallace (undisclosed) has agreed to a five-year, $139 million contract extension with the Thunder on Sunday, Shams Charania of ESPN reports.
Wallace gets rewarded with a rookie-scale contract extension that keeps him with the team through the 2031-32 campaign. The 22-year-old wing has developed into one of the more impressive two-way players in the league, earning Second Team All-Defense honors last season. Wallace could be in line for an expanded role going forward with the departures of Luguentz Dort, Isaiah Joe and Aaron Wiggins.
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Thunder's Cason Wallace: Ruled out Thursday
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Wallace (undisclosed) has been ruled out for Thursday's preseason game against the Rockets, Justin Martinez of The Oklahoman reports.
It's unclear why Wallace isn't playing in the Thunder's preseason finale, though his next chance to play will come in Tuesday's regular-season opener against the Spurs. Ajay Mitchell will start in Wallace's stead Thursday.
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Thunder's Cason Wallace: Not starting Thursday
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Wallace won't start Thursday's preseason finale against the Rockets, Jackson Gatlin of the Locked On Podcast Network reports.
Wallace will head to the bench in favor of Ajay Mitchell. The latter will be joined in the first unit by Shai Gilgeous-Alexander, Alex Caruso, Jalen Williams and Isaiah Hartenstein.
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Thunder's Cason Wallace: Playing Tuesday
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Wallace (rest) is available for Tuesday's preseason matchup with the Pacers, Justin Martinez of The Oklahoman reports.
As expected, Wallace will return to the lineup Tuesday after getting the night off during Monday's loss to Atlanta. He's expected to open the regular season as the Thunder's starting shooting guard following the offseason trade of Luguentz Dort (rest).
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Thunder's Cason Wallace: Not traveling for road trip
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Wallace (rest) won't play in Monday's preseason game against the Hawks, Clemente Almanza of USA Today reports.
Wallace and the rest of the Thunder's regulars won't travel to Atlanta for the first half of a back-to-back set, but they're expected to suit up Tuesday, when they host the Pacers. Wallace is expected to be the starting shooting guard on Opening Night but will face competition from Ajay Mitchell and Jared McCain throughout the season.
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Thunder's Cason Wallace: Set for action Wednesday
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Wallace (rest) is in line to play in Wednesday's preseason game against the Bucks, Justin Martinez of The Oklahoman reports.
Wallace appears set to play after missing the preseason opener. The swingman is vying for a larger role on the wing after the Thunder lost Luguentz Dort over the summer.
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Thunder's Cason Wallace: Will sit Tuesday
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Wallace will not play in Tuesday's preseason opener against New Orleans, Clemente Almanza of USA Today reports.
Wallace will travel with the Thunder despite being held out of the contest. With Oklahoma City resting several members of its regular rotation, younger players and roster hopefuls should receive extended opportunities Tuesday.
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Thunder's Cason Wallace: Could become full-time starter
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Wallace is the most likely replacement for Luguentz Dort in Oklahoma City's starting lineup after Dort was traded to the Hawks in mid-July, according to Anthony Slater of ESPN.
The Thunder traded Dort, Aaron Wiggins and Isaiah Joe in cost-cutting maneuvers this offseason, leaving increased playing time available for the likes of Ajay Mitchell, Jared McCain and Wallace. The 22-year-old started 58 of his 77 regular-season appearances in 2025-26 due in large part to Jalen Williams (hamstring) missing significant time, and with Dort out of the picture, Wallace has a strong chance to carve out a full-time role in the starting lineup in the 2026-27 campaign. He averaged 9.3 points, 3.1 rebounds, 2.9 assists and 2.1 steals across 27.7 minutes per game in his 58 starts last regular season.
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Thunder's Cason Wallace: Could see larger role
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According to Bryan Toporek of Forbes, Oklahoma City's decision to trade Isaiah Joe, Aaron Wiggins and Luguentz Dort was driven largely by financial considerations, creating a larger opportunity for Wallace entering 2026-27.
Wallace has already established himself as one of the Thunder's top perimeter defenders, and he could take on a more prominent offensive role while continuing to split backcourt minutes with Alex Caruso, Ajay Mitchell and Jared McCain. Wallace's all-around game will give him plenty of intrigue late in fantasy drafts.
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Thunder's Cason Wallace: Drains five threes in Game 7 loss
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Wallace logged 17 points (6-10 FG, 5-9 3Pt), seven rebounds, four assists, one steal and one block over 36 minutes during the Thunder's 111-103 loss to the Spurs in Game 7 of the Western Conference Finals on Saturday.
After coming off the bench in the Thunder's last two games, Wallace was back in the starting lineup for Game 7 to give the Thunder a spark in the absences of Jalen Williams (hamstring) and Ajay Mitchell (calf). Wallace was quiet for most of the night but came alive in the fourth quarter with 14 points, but it ultimately wasn't enough as the Thunder came up short in their title defense. Wallace is under a team option for the 2026-27 season, and it'll be interesting to see what his role is with Oklahoma City after starting in a career-high 58 regular-season games this past year and moving into the starting five for Game 7 of the Western Conference Finals.
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Thunder's Cason Wallace: Not starting Tuesday
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Wallace won't start Tuesday's Game 5 of the Western Conference Finals against the Spurs, Josue Pavon of ClutchPoints.com reports.
Jared McCain will get the starting nod with Jalen Williams (hamstring) and Ajay Mitchell (calf) sidelined, pushing Wallace back to the second unit. Through four games (one start) in the series, the third-year guard has averaged 9.0 points, 4.8 rebounds, 2.8 steals and 2.3 assists in 25.5 minutes per tilt.
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Thunder's Cason Wallace: Starting Game 4
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Wallace will start Sunday's Game 4 of the Western Conference Finals against the Spurs, Clemente Almanza of USA Today reports.
With both Jalen Williams (hamstring) and Ajay Mitchell (calf) sidelined, Wallace will enter the starting lineup for the first time this postseason. The Thunder were 15-0 in the regular season when the 22-year-old joined Shai Gilgeous-Alexander, Luguentz Dort, Chet Holmgren and Isaiah Hartenstein in the first unit. Over three outings against San Antonio in the Western Conference Finals, Wallace has averaged 10.3 points, 5.0 rebounds, 3.0 steals and 2.7 assists in 27.0 minutes per contest.
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Thunder's Cason Wallace: Well-rounded performance in win
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Wallace closed Friday's 123-108 win over the Spurs in Game 3 of the Western Conference Finals with 11 points (3-8 FG, 2-6 3Pt, 3-4 FT), five rebounds, four assists and three steals in 28 minutes.
Although he wasn't very efficient, Wallace still scored in double figures for a second straight game while providing a well-rounded impact. The 22-year-old guard also led the Thunder in steals and has now tallied multiple swipes in three consecutive contests. Through three games in the Western Conference Finals, he's averaging 10.3 points, 5.0 rebounds, 3.0 steals and 2.7 assists in 27.0 minutes per tilt.
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Thunder's Cason Wallace: Not listed on injury report
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Wallace (toe) is not on the injury report for Sunday's Game 1 matchup with the Suns.
Wallace missed Oklahoma City's final two regular-season games with a minor toe issue, but he'll return to the lineup for the playoffs. Wallace put in averages of 8.6 points, 3.1 rebounds, 2.6 assists, 1.3 triples and 1.9 steals per game in the regular season.
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Thunder's Cason Wallace: Unavailable for Friday
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Wallace is listed as out for Friday's game against Denver due to left great toe soreness, Clemente Almanza of USA Today reports.
This will mark Wallace's first absence since Jan. 27, as the Thunder are resting a large number of their usual rotation players with the No. 1 seed already locked up. He'll have one more chance to appear in the regular season, Sunday against Phoenix, before the playoffs begin.