A "devastated" Essendon forward Alwyn Davey will miss the rest of the AFL season after scans confirmed he required a full knee reconstruction.

Davey injured his right knee during a routine training drill last Thursday.

"The results of his scans confirmed our worst fears and Alwyn will miss the rest of the season," team manager David Calthorpe said on the club's website.

"He will have surgery in the next week or so and will then start his rehabilitation program.

"The injury takes about 10-12 months to recover and, all going well, we hope to have him back for round one next year."

Calthorpe said Davey would be placed on the long-term injury list but there were no plans to rush a player up from the rookie list to replace him.

The latest blow for the 24-year-old speedster comes after he missed the final eight games of last season, his debut year, with a broken arm.

"I was pretty devastated to hear the news," Davey told the Seven Network.

"I didn't think it was going to be that bad, but when it came out, it was pretty bad. I just have to get back on track next year."

Meanwhile struggling West Coast have suffered another blow with young midfielder Shannon Hurn ruled out for four to six weeks with a fractured fibula.

The club initially thought he had only sustained a corked calf in an incident during Saturday night's loss to the Western Bulldogs.

The extent of a knee injury to experienced defender Adam Hunter was yet to be established with Hunter having scans after hyperextending the knee in the same match.

North Melbourne confirmed forward Aaron Edwards suffered a leg fracture when he fell awkwardly after marking in Sunday's match against Sydney at Telstra Dome.

He is expected to be out for six to eight weeks, although the club was still waiting on a more extensive diagnosis.

And Fremantle have four players in doubt for Sunday's MCG match against Melbourne.

Steven Dodd (knee), Antoni Grover (quad) and Roger Hayden (hamstring) were all injured during Friday night's heartbreaking loss to Geelong, while Des Headland (knee) was a late withdrawal from that match.

And the Western Bulldogs said veteran midfielder Scott West would need further assessment during the week, after having scans because of knee soreness.

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