Collingwood’s undefeated start to the 2012 AFL pre-season has been soured by Brent Macaffer’s knee injury, with coach Nathan Buckley expecting the worst.

The Magpies rocketed to the top of the pre-season ladder on Saturday night with a three-point win over Greater Western Sydney and a seven-point triumph over Western Bulldogs.

However, it looks to have come at a major cost – quite possibly Mcaffer’s chances of playing again this year.

“Unfortunately Brent Macaffer’s more than likely done his ACL (anterior cruciate ligament). Which is a poor result for us,” Buckley said after his first games at the helm of the Magpies.

“You talk about winning and losing, but the major thing you want out of games like this is to just get everyone through without an injury.

“It’s not looking good for ‘Caff but we’ll see what the scans say in the next couple of days.

“…It’s really unfortunate for him. We hope for the best but we expect the worst.”

Macaffer was part of Collingwood’s 2010 premiership side, but played only four games last year due to injury.

“He really struggled with injury last year.

“Some people seem to get more obstacles than they deserve. He’s had a fantastic pre-sesaon, he’s put himself in decent nick.

Greater Western Sydney and Western Bulldogs escaped the game without any serious injuries.