Brisbane recruit Marcus Adams will be out for up to eight weeks following arthroscopic surgery on his knee on Monday.
Adams arrived from the Western Bulldogs in the AFL off-season but has failed to add to his 27 AFL games thanks to an inability to fully recover from the lingering injury.
Lions football manager David Noble said the key defender had been close to a return but an impingement in his knee was restricting him getting back to 100 per cent.
"He has completed 90 per cent of his rehab program, predominantly straight-line work and the issue is when we have increased his agility work," Noble said.
"This operation should alleviate that."
