Geelong midfielder Scott Selwood has confirmed he is almost certain to miss at least a week with a hamstring injury.

Selwood spent the last quarter of the Cats' loss to West Coast at Domain Stadium on the bench after suffering a minor hamstring tear on Thursday.

The young brother of skipper, Joel, revealed on K-Rock radio on Monday morning he is set to miss this week's clash with Fremantle at Simonds Stadium, however, did not put an exact time frame on his return.

“I got a little tear in my hamstring,” Selwood said.

“I got pretty good scans results to say it’s not too bad and hopefully I won’t miss too much footy.

“I’m going to try and push to play as soon as possible.”

However, he said the news is not so good for teammate Nakia Cockatoo, who is expected to miss a little longer, also with a hamstring injury.

Geelong was a man down from the opening few minutes, with Cockatoo tearing his hamstring early in the first quarter.

“That’s Nakia’s second hamstring in four weeks, so he’ll probably spend a bit more out than what I will,” Selwood said.

“Nakia’s probably got a bit of a different path to me, but hopefully we can get him back as quickly as possible as well.”