Thornton was released by the 49ers on Friday.
Thornton came out of retirement in April after sitting out the 2018 season. It appears he did not make enough of an impression to make a serious bid at landing on the 49ers' roster. It is unclear if the 30-year-old will continue his efforts at a comeback after this news.
Thornton was reinstated to the 49ers' active roster Monday, Field Yates of ESPN reports.
After announcing his retirement last August, Thornton now rejoins the 49ers on the first day of their offseason program. The 30-year-old has spent time with the Eagles, Cowboys and Bills across seven seasons, appearing in 89 career games with 48 starts, 278 tackles and 7.5 sacks. He projects to compete for a depth role at defensive tackle this offseason.
Thornton announced his retirement from the NFL on Wednesday.
Thornton's seven-year NFL journey began in Philadelphia as an undrafted free agent. Along the way, Thornton made stops in Dallas, Buffalo and most recently, Tampa Bay. Over his career, Thornton registered 278 tackles and 7.5 sacks.
Thornton signed a contract Wednesday with the 49ers.
Thornton has been a bit of a journeyman throughout his NFL career, logging stints with the Eagles, Cowboys and Bills across seven seasons. He has appeared in 89 games (48 starts) and registered 278 tackles and 7.5 sacks. The 30-year-old will likely vie for a depth role along the defensive line during training camp.
Thornton signed a contract with the Bills on Tuesday.
The 29-year-old was on the open market for only a few days after the Cowboys cut ties with him when a hamstring injury sidelined him for much of training camp. Buffalo's decision to bring Thornton aboard suggests he's reasonably healthy now, but it's not expected that he'll see many snaps this season behind the dominant defensive tackle tandem of Marcell Dareus and Kyle Williams.
Thornton was released by the Cowboys on Sunday, Todd Archer of ESPN.com reports.
The Cowboys had to cut someone to make room for newly acquired linebacker Jayrone Elliott. Thorton had been dealing with some injuries recently and wasn't expected to be a major contributor among the defensive front this season which made him an expendable candidate.
Thornton (hamstring) made his return to Cowboys' practice Wednesday, David Helman of the Cowboys' official website reports.
Thornton has been bothered by a hamstring injury for several weeks but is seemingly feeling better. It's unlikely the Cowboys would allow the 29-year-old to participate in practice unless they were comfortable with his health. However, with all the time he has missed during training camp, his starting role could potentially be in jeopardy.
Thornton (hamstring) practiced in a limited fashion Monday, Drew Davison of the Fort Worth Star-Telegram reports.
Thornton has been dealing with a hamstring injury the past couple of weeks, but it sounds as though he's finally making some progress in his recovery. The 29-year-old should increase his activity in the days to come, but because of all the time he's missed in the preseason, he may no longer be guaranteed a starting role heading into Week 1.
Thornton suffered a hamstring injury during practice Tuesday, Brandon George of The Dallas Morning News reports.
Thornton joined Tyrone Crawford (leg) as a starting Cowboys defensive lineman to exit practice early Tuesday. It's unclear how Thornton suffered his injury or how severe it is. If he's limited or held out at all going forward look for Jordan Carrell and Joey Ivie to see some extra reps.
Thornton left Tuesday's practice with a hamstring injury, Clarence Hill Jr of the Star-Telegram reports.
Thornton underwent shoulder surgery back in January, but was cleared for the start of training camp. However, he's now dealing with a hamstring injury following Tuesday's practice, although the exact severity is currently unknown. More details should be provided later this week, but there's a chance Thornton is held out of Saturday's preseason opener against the Rams depending on how the injury responds to treatment.
Thornton underwent shoulder surgery earlier this week, Brandon George of The Dallas Morning News reports.
Thornton had been battling an ankle injury during the playoffs but it looks he's now dealing with some shoulder problems. While there is some cause for concern, the Cowboys remain confident that Thornton will be just fine moving forward. In his first season with Dallas, the 28-year-old recorded 22 tackles across 13 games.
Thornton (ankle) is listed as active for Sunday's playoff game against the Packers, ESPN's Todd Archer reports.
Thornton's availability boosts the Cowboys' defensive tackle depth, but with 22 tackles and 1.5 sacks in 13 games this season, the former Philadelphia Eagle is only an option in the deepest of IDP formats.
Thornton (ankle) is listed as questionable for Sunday's playoff game against the Packers.
Thornton hasn't taken the field since Week 14. Even if cleared to play, he's stuck in a reserve role at defensive tackle.
Thornton (ankle) was limited in practice Wednesday, but says he'll be able to play Sunday against the Packers, the Ft. Worth Star-Telegram reports.
He missed the last three games of the season with the injury, but the time off appears to have been enough to get Thornton back into playing shape. He finished his first season in Dallas with 22 tackles, 1.5 sacks and a forced fumble through 13 games as a rotation piece in their defensive line.
Thornton (ankle) was ruled out of Sunday's game in Philadelphia.
Thornton wasn't able to practice this week and will miss his third straight game.
Thornton (ankle) is inactive for Monday's game against the Lions, Todd Archer of ESPN reports.
Thornton was held out of practice throughout the week and his absence comes as little surprise. Look for Terrell McClain to again see extra time while Thornton is sidelined for the second straight game.
Thornton (ankle) is inactive for Sunday's Week 15 matchup with the Buccaneers, David Helman of the Cowboys' official site reports.
Crawford was closer to doubtful than questionable after he sat out each of the Cowboys' practices this past week. Terrell McClain will see an expanded role Sunday as Crawford works toward a possible return in Week 16.
Thornton (ankle) is questionable for Sunday's tilt with the Buccaneers, Todd Archer of ESPN.com reports.
Thornton missed practice all week but could still take the field Sunday. Look for more updates to come closer to kickoff, with starter Terrell McClain taking on a larger role should Thornton be ruled out.
Thornton (ankle) did not participate in practice Friday, Jon Machota of Dallas News reports.
Thornton has been unable to practice throughout the entire week, so his availability for Sunday's game against the Buccaneers doesn't look too promising.
Thornton signed a four-year, $18 million contract with the Cowboys on Thursday, the Dallas Morning News reports.
A run-stuffing defensive end in the Eagles' 3-4 defense, Thornton will shift inside for the Cowboys and line up next to Tyrone Crawford at defensive tackle, replacing Nick Hayden in the starting lineup. There won't be a lot of IDP value for Thornton in that role, but he should help solidify Dallas' team defense, and having a more active partner at DT could boost Crawford's numbers as well.