Marks signed a one-year contract with the 49ers on Wednesday, Max Meyer of NFL Network reports.
Marks, who had 8.5 sacks with the Jaguars as recently as 2014, isn't guaranteed a roster spot and will need to compete for a role at defensive tackle behind starters DeForest Buckner and Earl Mitchell.
Marks was released by the Jaguars on Thursday, Ryan O'Halloran of the Florida Times-Union reports.
Marks' release will clear $4.475 million in cap space for the Jaguars as they get set to sign big-time free agents Calais Campbell and A.J. Bouye. Campbell will effectively replace Marks along the Jaguars defensive line. During his four years in Jacksonville, Marks recorded 16 sacks and two forced fumbles.
Marks (triceps) returned to practice on Friday for the Jaguars' final day of OTAs, Hays Carlyon of the Florida Times-Union reports.
Marks was a participant during individual drills for the first time this offseason after suffering torn triceps during November of the 2015 campaign, leading to an injured reserve designation. "It felt good just getting back, trusting the process, going out and not having any hiccups," Marks said Friday regarding his return to the practice field. The 6-foot-2, 294-pound veteran also believes he'll be a full participant for training camp, which begins in late July. He's expected to receive a lighter snap load throughout the 2016 regular season regardless, one reason being the addition of Malik Jackson in free agency.
Marks (triceps) will not participate in the Jaguars' OTAs.
Marks is coming off a torn triceps that limited him to just four games last year, when his season didn't start until October due to a torn ACL suffered in 2014. Considering Marks posted a career-high 8.5 sacks that season, the Jaguars are understandably taking caution to ensure he returns to full health when needed this season, thus explaining his absence from OTAs.
Marks (torn triceps) will be placed on season-ending injured reserve Tuesday afternoon, NFL Network's Jeff Darlington reports.
It's been a rough 11 months for Marks, who managed 8.5 sacks and 44 tackles last season, but then suffered a torn ACL in Week 17. He subsequently made just four appearances this season, recording six tackles, three passes defensed and zero sacks. The good news is that he'll be further removed from the ACL injury next season, and the torn triceps should be healed before training camp.
Marks suffered a torn triceps during Sunday's win over the Ravens, the Florida Times-Union reports.
Marks' injury is likely season-ending, compounding a frustrating 2015 campaign for the defensive lineman. After a career-high 44 tackles and 8.5 sacks last season, a knee injury contributed toward Marks making just four appearances this term, resulting in only six tackles and no sacks.
Marks (knee) is active Sunday against the Texans.
Marks will make his season debut after tearing his ACL last year. He provided great inside pass rush pressure before his injury, and if he's completely healthy, will provide a big boost to the Jaguars defense.
Marks (knee) is probable for Sunday's matchup with the Texans, John Oesher of Jaguars.com reports.
Marks will be making his 2015 debut if he is able to go on Sunday. The defensive tackle tore his ACL in Week 17 of the 2014 season. He was taken off of the PUP list heading into the season but wasn't able to get back on the field until earlier this week, where he was a full participant in practice.
Jaguars defensive tackle Sen'Derrick Marks (knee) was a full participant in practice Thursday, Hays Carlyon of the Florida Times-Union reports.
Marks had surgery to repair his torn ACL and hasn't been able to suit up this season. His practice status Friday will likely dictate whether he plays in his first game of the 2015 season Sunday against the Texans.
Marks (knee) is inactive Sunday against the Bucs.
With Marks out, Tyson Alualu is expected to date over at defensive tackle. This is potentially good news for Doug Martin and the Bucs running game.
Jaguars defensive tackle Sen'Derrick Marks (knee) is questionable for Week 5, Ryan O'Halloran of the Florida Times-Union reports.
Marks hasn't played yet this season, but he was able to complete one-on-one drills for the first time since tearing his ACL. He will likely be a game-time decision Sunday.
Jaguars defensive tackle Sen'Derrick Marks (knee) is listed as doubtful to play Sunday against New England, the team website has reported.
It looks like Marks will sit out for the third straight week as he continues to recover from a torn ACL suffered in Week 17 of last season. He's progressing rather quickly, however, and the Jaguars are expecting a return within the next few weeks. Marks led the team with 8 1/2 sacks in 2014.
Jaguars defensive tackle Sen'Derrick Marks (knee) has been ruled out for the Week 2 battle against Miami, reports Hays Carlyon of the Florida Times-Union.
Marks continues to work his way back from offseason surgery to repair a torn ACL, and he'll sit out a second straight week to start the season.
Considering the surgery took place in January, Marks appears to be ahead of schedule in his rehab, and the fact that he's on the active roster rather than a long-term injury list indicates that he's expected back within the next few weeks.
Jaguars general manager David Caldwell says it's unlikely that defensive tackle Sen'Derrick Marks will be ready for Week 1, according to the team.
Marks is recovering from a torn ACL. Calrdwell added that Marks should return before Week 6.
The Jaguars placed safety James Sample and offensive lineman Sen'Derrick Marks on the Physically Unable to Perform list on Tuesday, reports the Florida Times-Union.
Sample is dealing with a broken right arm, while Marks is recovering from a torn ACL.
Jaguars coach Gus Bradley said Thursday the only players that won't be ready when training camp begins next month are safety James Sample and offensive lineman Sen'Derrick Marks, reports the Associated Press.
Sample is recovering from a broken right arm, which he sustained during organized team activities. Meanwhile, Marks is trying to work his way back from a torn ACL, which he suffered in the season finale last season.
Jaguars defensive tackle Sen'Derrick Marks is "on track" in his recovery from a torn ACL, general manager Dave Caldwell told the Florida Times-Union. Marks, who suffered the injury in the season finale, hopes to be ready for training camp.
The sixth-year pro set career highs with 44 tackles and 8.5 sacks.
The Jaguars announced Monday that defensive tackle Sen'Derrick Marks has a torn ACL that will need reconstruction, reports the Associated Press. Marks is going through the prerehab process before he goes under the knife.
Marks sustained the injury in a Week 17 loss to Houston. His season ends with 44 combined tackles, 8 1/2 sacks and one fumble recovery.
Jaguars defensive tackle Sen'Derrick Marks was ruled out for the remainder of Sunday's season finale at Houston with a knee injury, according to the team's official website. Marks registered two tackles, including one for a loss before leaving the game in the first half. He told reporters he's getting an MRI on his knee on Monday. His season ends with 44 combined tackles, 8 1/2 sacks and one fumble recovery.
The Jaguars have ruled out defensive end Andre Branch (groin) and linebacker Khairi Fortt (hamstring) for Sunday's game against the Texans.
Linebacker LaRoy Reynolds (neck) and wide receiver Tommy Streeter (abdominal strain) were both deemed as questionable, despite practicing Friday.
Meanwhile, quarterback Blake Bortles (right shoulder, left ankle), defensive end Chris Clemons (knee), safety Josh Evans (foot), linebacker Jeremiah George (ankle), running back Toby Gerhart (shoulder) and defensive tackle Sen'Derrick Marks (foot) were ruled out Week 14.