Hawthorn will learn on Monday the severity of their latest AFL injury concern when forward Mark Williams undergoes scans on his knee.

Williams suffered a suspected a medial ligament strain at Subiaco Oval on Saturday night when the Hawks were upset by West Coast.

He will be assessed on Monday but can expect to spend a decent stint on the sidelines, just as the reigning premiers begin the month that will likely determine their finals destiny, with matches against the Western Bulldogs, North Melbourne, Collingwood and Geelong.

The Hawks have endured a wretched season with injuries, which continued against the Eagles when Stewart Dew (quad) and Stephen Gilham (virus) pulled out beforehand, and Brent Guerra (thigh), Jordan Lewis (hip) and Xavier Ellis (thigh) played out the game sore.

Gilham was set to make his return from a knee injury - having played just one game this season - until he contracted a virus last week.

Fremantle captain Matthew Pavlich is expected to miss two games with a calf tear after he was injured in Saturday's loss to Collingwood at the MCG.

The Dockers also lost defender Antoni Grover to a corked leg and had Steven Dodd concussed after he collided with teammate Dean Solomon.

Essendon expect midfielder Jobe Watson to miss two games because of the ankle injury he suffered in Friday night's big win over Carlton at the MCG.

The Bombers are thankful the injury is not worse, but it does mean the in-and-under ballgetter will not play in this Friday night's blockbuster against Collingwood.

The Blues will assess defender Paul Bower after he hurt his knee in the third quarter of Friday night's game.

Western Bulldog Daniel Giansiracusa overcame a rolled ankle and knock to the knee to return and boot three goals against North Melbourne on Sunday at the MCG.

But young Kangaroo Ben Warren was not as fortunate, as he suffered a broken fibula in his left leg, which could end his season.

Warren was playing his first game since returning from a fractured cheekbone suffered against St Kilda in round 11.

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