Contrary to his coach Michael Voss, Brisbane Lions veteran Luke Power has admitted champion skipper Jonathan Brown is "not 100 per cent" ahead of their crunch AFL clash with Collingwood.

But Power - who will celebrate his 250th AFL game at the Gabba on Saturday night - has backed Brown to "kick a bag" against the high-flying Magpies.

Voss was adamant he was not considering resting Brown despite the star forward clearly being hampered by an abdominal strain while going goalless in their 12-point loss to Adelaide on Sunday - their fifth-straight defeat.

Voss said Brown would line up for the Lions as long as medical staff kept telling him he was "ready to go".

"That's all I can go on," Voss said.

However, the Lions coach could not guarantee if Brown would train at all in the build-up to the Pies clash after spending last week being treated by an Adelaide specialist.

But Power was confident Brown would bounce back into form against the No.2 Collingwood outfit despite admitting the forward was battling for fitness.

"Browny will be fine, he will come out and kick a bag I am sure this weekend," Power said on Tuesday.

"He's probably not 100 per cent but he is so strong physically and mentally.

"I am sure he will be fine. He is such a great leader and it is great to have shared a lot of my footy with him."

Power will become just the 12th player in club history - including Fitzroy and Brisbane Bears - to have cracked the 250-game barrier.

Voss will be sweating on Brown's fitness as they line up against a Pies outfit that could snuff out the Lions' faint finals hopes.

"I could probably think of a better time to be playing them - our backs are certainly up against the wall," Voss said.

"After losing five games in a row, these issues of confidence come to the fore.

"But in big games like this one, sometimes you can just put that all behind you and attack the game full-on.

"Collingwood are playing a very good brand of football and they certainly warrant the position that they're in."

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