Geelong have lost another key defender for Sunday's AFL match against West Coast, with Harry Taylor joining captain Tom Harley as a definite omission.

Harley is out for two-to-three weeks after hurting his hamstring last Sunday against Essendon and Taylor suffered an ankle injury in the same game.

Paul Chapman (finger), Joel Corey (foot), Ryan Gamble (concussion) and Tom Lonergan (ankle) were added to the squad for the Sunday game at Subiaco, while Mathew Stokes returns from suspension.

Before Thursday training, coach Mark Thompson admitted some doubt about whether Chapman and Corey would be fit for this weekend.

But he said Gary Ablett was a near-certainty to play after also hurting his ankle in the win over the Bombers.

"I'm pretty sure Gary will be right, he's a 95 per cent chance," Thompson said.

"With ... Joel, (he's) not certain to play at this stage and (he'll) have to tick a few boxes.

"Chapman needs to catch the ball - he's been given approval to play as long as he's happy to play (and) he can tolerate the pain.

"We'll find out a bit (on Thursday) with the wet balls and see whether he gets through, he's pretty keen to play.

But the injury situation is not all bad news for the unbeaten Cats, who can bring in players for mid-season senior experience when there is minimal pressure on the side.

"All year, we've taken an angle that we really want players fit, closer to 100 per cent fit than we have before, ever," Thompson said.

"In some ways, the only way they are going to get game time is if there are injuries.

"We don't want injuries, but at the same time the fact we're having a few, it's a great opportunity for people like Nathan Djerrkura and some of these young boys to get games."

Thompson also took a cheeky shot at tough forward Max Rooke after last Sunday's clash of heads with teammate Joel Selwood.

Asked what he made of the incident, Thompson replied: "That Joel Selwood is tougher than Max Rooke - because Joel continued to tackle the bloke while Max was lying on the ground asleep."

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