North Melbourne's hard-fought draw against Sydney has come at a significant cost, with key forward Aaron Edwards breaking a bone in his lower leg which is expected to rule him out for six weeks.

Edwards sustained the injury when he fell awkwardly after marking late in the second quarter.

It continues a bad run of serious injuries for the club.

"It's the first time it's probably happened for a while," coach Dean Laidley said of the loss of personnel.

"We've got two knee reconstructions (to Nathan Grima and Leigh Adams), a shoulder reconstruction (to Robbie Tarrant), we've had Leigh Brown with his (broken) hand, we've had (a knee injury to Josh) Gibson, two suspensions this weekend - (Scott) McMahon and (Daniel) Pratt - which probably cost us.

"Now to lose Aaron Edwards, we're starting to bank up a fair bit, which gives everyone else an opportunity."

Meanwhile, Port Adelaide star Chad Cornes will be sidelined for up to four weeks, after having surgery to fix a broken finger.

Cornes sustained the injury early in Saturday night's win over St Kilda at AAMI Stadium, although after a spell in the rooms he returned to the ground to play an important role in the victory.

The Power won't be the only team hurt by Cornes' absence, with the injury to also prevent him from playing for the Dream Team in the Hall of Fame tribute match at the MCG on May 10.

Struggling West Coast received another blow during their big loss to the Western Bulldogs, with key defender Adam Hunter hyperextending his left knee.

Hunter will be scanned on Monday, but is likely to spend at least a fortnight on the sidelines.

Teammate Shannon Hurn sustained a corked calf in the same match, but could be available for Friday night's clash with Carlton at Subiaco.

The Blues have some injury concerns of their own, with defender Bret Thornton to miss up to six weeks with a strained knee medial ligament.

And young tall forward Adam Hartlett is expected to be out for at least two weeks with a hamstring strain.

Essendon speedster Alwyn Davey will have scans on Monday, which are expected to confirm that he has ruptured an anterior cruciate ligament at training last Thursday and needs a season-ending knee reconstruction.

Key defender Dustin Fletcher will miss at least one game with a strained adductor.

Geelong skipper Tom Harley is expected to miss next Saturday's match against Brisbane with a buttock injury, which could also rule him out of playing for the Dream Team the following weekend.

And Fremantle have some major problems ahead of next Sunday's must-win MCG clash with Melbourne.

The Dockers could be without Roger Hayden (thigh), Steven Dodd (knee) and Antoni Grover (thigh), all hurt in Friday night's heart-breaking one-point loss to the Cats.

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