Collingwood is counting the cost of its win over North Melbourne at Etihad Stadium on Saturday night, with midfield pair Daniel Wells and Levi Greenwood likely to miss next weekend's clash with Port Adelaide through injury.

Greenwood hyper extended his knee in a collision with Roos ruckman Todd Goldtsein and is believed to have injured his medial ligament.

"The doc's really confident that there's no significant structural damage outside that. But we're still thinking that there's damage to maybe a medial ligament or the like," Pies coach Nathan Buckley said post-match.

"We'll do the scan and we'll see, but we don't expect that he'll get up for a couple of weeks."

The in-form Wells, who Buckley revealed carried a corky into the game, could also miss with soreness.

"He (Wells) trained pretty well during the week, so we went in clean and clear. He had an incident during the second quarter where he stretched for a ball and I think it went from pretty good to not great," Buckley said.

"He was able to play the game out but we'll wait for the dust to settle before we see what sort of damage he did in that incident.

"I think he's disappointed with his output for the night, and the fact he wasn't able to contribute as much as he would have liked against his old side.

"We've got eight days, so we've got a little bit of time into Port to see whether he's available for us next week."

Meanwhile, ruckman Brodie Grundy faces a nervous wait for the Match Review Panel results, after he left Roos forward Ben Brown concussed after a tackle.