Russell was placed on injured reserve by the Cardinals on Tuesday, Darren Urban of the team's official website reports.
Russell suffered a concussion at practice in late July, ultimately remaining sidelined throughout the entirety of the preseason. The linebacker is now set to miss the entirety of the 2025 campaign while on IR, unless he's able to reach an injury settlement with the team.
Russell was placed in concussion protocol Friday, Tyler Drake of ArizonaSports.com reports.
Russell suffered a head and neck injury during Thursday's practice, which led to him being carted off the field. He was taken to a local hospital for evaluation, but he was cleared to re-join training camp after undergoing tests. Russell will be limited in his activities until he is able to clear the league's five-step concussion protocol.
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Cardinals' J.J. Russell: Carted off practice field
Rotowire
Russell was transported to a local hospital after injuring his neck and head during Thursday's practice.
Russell suffered the injury after a hard collision with Kitan Crawford during team drills. Russell was eventually carted off the field but was alert and had movement in his extremities. He'll undergo further testing to determine the severity of his injury, but he appears to be in jeopardy of being sidelined for an extended period of time.
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Buccaneers' J.J. Russell: Will suit up Sunday
Rotowire
Russell is considered active ahead of Sunday's game versus the Chargers.
Russell missed last week's win against the Raiders due to a hamstring injury. The third-year pro suited up for the previous 12 games for Tampa Bay, totaling 22 tackles. He's also seen increased playing time on defense recently, peaking at 60 percent of defensive snaps played Week 13 versus Carolina.
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Buccaneers' J.J. Russell: Ruled out for Week 14
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Russell (hamstring) has been ruled out for Sunday's game against Las Vegas, Greg Auman of Fox Sports reports.
Russell and outside corner Josh Hayes both popped up on Friday's injury report due to hamstring injuries, and both players will be sidelined Sunday. With K.J. Britt (ankle) also ruled out for Sunday's contest, Antonio Grier is set to start at inside linebacker alongside Lavonte David.
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Buccaneers' J.J. Russell: Stands out in preseason finale
Rotowire
Russell recorded 11 tackles (nine solo) in the Buccaneers' 26-20 preseason win over the Ravens on Saturday night.
The reserve linebacker comfortably led the Buccaneers in tackles while logging a unit-high 48 snaps on defense. Russell was able to make his first six NFL regular-season appearances as an undrafted rookie a year ago, recording six tackles across 44 snaps from scrimmage while also seeing another 145 snaps on special teams. Russell recorded 15 tackles overall this preseason, and he may have earned his way onto the roster again as a rotational option with a chance to see more playing time this coming season.