Geelong could be without another star midfielder next weekend after Jimmy Bartel suffered a heavy concussion in Saturday night's 28-point win over St Kilda.

The Cats recorded their 12th AFL win from 12 outings this season with a 15.10 (100) to 11.6 (72) victory over St Kilda in front of 39,539 fans at the MCG.

Brownlow Medallist Bartel suffered concussion in the first quarter after his head smashed into team-mate James Podsiadly's hip in a marking contest and was was replaced at quarter-time by Mitch Duncan.

Duncan was also knocked out in a heavy tackle from St Kilda's Justin Koschitzke in the second term however Duncan returned in the third quarter.

The Cats went into the game without gun onballer Joel Selwood who is serving the first week of a four-match ban for striking Hawthorn's Brent Guerra.

"He (Bartel) has got a sore head, he has got a bit of memory loss," Cats coach Chris Scott said.

"As is always the case with concussion, it's going to take a little bit of time to assess him.

"In three days he could be perfect, in three weeks he might be not quite right. We just don't know."

James Kelly carried an ankle injury in the second half and defender Darren Milburn was nursing an Achilles complaint.

Scott said the club felt the injuries to Kelly and Milburn were minor and they had not been ruled out yet for next Saturday's game against Adelaide.

The Cats mentor said he was pleased with the effort of 19-year-old Daniel Menzel who kicked four goals.

"It's really important that we don't bring those young players in and hide them," Scott said.

"We've got to get them in the action because they're the ones who are going to have to turn games in three or four years the way Bartel and (Paul) Chapman do."

Scott described Geelong's win as workmanlike.

"We were unhappy for most of the night in the coach's box and I think the players were a little bit that way as well," he said.

"Things that we wanted to get done were good in parts but we did let them score a little bit too easily which kept them in the game.

"With the personnel we had down it was a good effort. But I'm sure Rossy (Saints coach Ross Lyon) was sitting in the box thinking 'we'd love to have Lenny Hayes'.

"They have been hit hard by injury and we're certainly not going to use injury as an excuse for our performance.

"We got the job done."

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