NORTH Melbourne skipper Brent Harvey is in doubt for miss Sunday's crucial twilight clash against the Western Bulldogs at Etihad Stadium after seeking treatment for a thumb injury.

Harvey suffered the injury during his team's embarrassing 117-point loss to Collingwood at the MCG last weekend.

The loss of Harvey would be a massive blow for the Kangaroos, who need to beat the resurgent Bulldogs to keep their slim finals hopes alive.

The Roos' capitulation against the Magpies left them six points shy of eighth-placed Essendon with seven games to play.

Given North Melbourne kicked only three goals against Collingwood and conceded 22, key forward Drew Petrie admits reviewing the match was a tough task.

"Yesterday we did sit through a fair bit of it," Petrie said at Aegis Park on Tuesday morning. "Match review did go a little bit longer than usual.

"We had a lot to look at to understand why we got beaten so badly.

"There were a lot of little things that culminated into big things. We just didn't play as a team.

"I think we went into our shells during the second quarter when they got a run-on.

"They got lots of goals at the start of each quarter, and every time that happened we hid away.

"I'm not sure we became selfish, but we probably looked after our own interests and didn't work as a team as well as what Collingwood do."

Petrie says it is vital the Kangaroos make a statement when they meet the Bulldogs on Sunday.

"I think over the last few months we've spoken about being competitive with sides above us, and in the top four especially," he said.

"We've done a lot of talking about that, but there haven't been a lot of actions in response when it comes to game day.

"We need to put the talking to one side and get out there and prove our worth with our actions."

With the AFL celebrating Multicultural Round this weekend, the prospect of promoting young ruckman Majak Daw has been raised.

But Petrie believes the 20-year-old, who was born in Sudan, is unlikely to make his AFL debut this season.

"You don't want to throw a fella in when he's not ready," Petrie said.

"I think that would probably be the wrong way to do things. Majak's playing footy at VFL level and that's a great start.

"Once he can do that for a long period of time, then I reckon he'll be ready for the next step."