Brinson had already been ruled out for Sunday after suffering a groin injury during Wednesday's practice. He was trying to return from a calf injury that had kept him out of the first three games. Saturday's move to injured reserve extends that absence; Tom Silverstein of the Milwaukee Journal Sentinel reported that Brinson must miss at least four more games.
Coach Matt LaFleur said Friday that the new injury would require significant time to recover. Green Bay's official report identifies the groin problem as a practice injury and the earlier calf issue as one sustained during warmups before the August 21 preseason game in Denver. Brinson has yet to play a regular-season snap this year.
The Packers also remain without defensive lineman Anthony Campbell, who was ruled out with an ankle injury. Brinson's placement leaves the defense with fewer interior options while Cooper's clearance settles a different part of the lineup. Green Bay did not announce a corresponding signing to fill Brinson's roster spot Saturday.
The changes come during a broader stretch of roster adjustments. Guards Aaron Banks and Jacob Monk are also out against Tampa Bay, and center/guard Jager Burton remains questionable. Green Bay added veteran guards Kevin Zeitler and Laken Tomlinson to the active roster this week and signed Mekhi Becton Sr. to the practice squad.