Fremantle young gun Rhys Palmer may not play again this AFL season after coach Mark Harvey revealed the midfielder was battling a knee injury.

Palmer, a favourite to win the 2008 Rising Star award after a spectacular debut season, was left out of the team that beat Melbourne by 46 points.

Harvey said Palmer, snared with pick No.7 in last year's national draft, would be assessed at training before a final decision was made on his future.

"We've got to weigh up what we do with Rhys," Harvey said.

"Rhys has got a minor complaint at this stage ... he's got a knee problem at the moment.

"We are going to have to make a decision with him. It's not ligament, it's cartilage."

When asked if that meant Palmer would not play again this season, Harvey replied: "It could be a possibility, We'll just see how Rhys trains this week."

The 19-year-old has been a revelation for the Dockers this season, averaging 22.6 possessions a match in 14 appearances.

Meanwhile, veteran Shaun McManus is rumoured to be on the verge of announcing that season 2008 will be his last.

McManus was amongst his team's best against Melbourne, collecting 20 possessions and booting a goal.

But after a newspaper article suggested McManus would announce his retirement plans on Monday, the 32-year-old added fuel to that fire when his three sons accompanied him as Fremantle belted out their team song after the win over Melbourne.

"Obviously there was the article today that suggested his last game would be in a couple of weeks' time, we'll wait and see," Harvey said.

"I think he knows in time it (retirement) is getting closer. This might have been one of the rare occasions where he can celebrate (a win with his kids), Shaun's enjoying every moment from here on end."

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