Carlton's attack is looking disturbingly thin after key forward Jarrad Waite was struck down by a knee injury which will sideline him for at least a month.

Waite suffered the medial ligament damage during Sunday's 92-point AFL loss to St Kilda at the MCG.

With fellow forward Brad Fisher already out, after he fractured his shoulder last weekend, the Blues will have an enormous reliance on full-forward Brendan Fevola.

Fevola kicked all four of his side's goals, to join Sydney's Barry Hall at the top of the AFL goal-kicking table with 30 apiece.

"Everyone has injuries but it doesn't help out the group to lose a Fisher and a Waite in successive weeks," coach Denis Pagan said.

"It nearly obliterates the forward line. But we'll continue to work at it, we know it's going to be up and down, we know it's going to be a tough ride."

Pagan said scans were needed to determine the full extent of Waite's injury.

"The first assessment was that it was grade two, I reckon that's a four or five-week injury," he said.

"If it's a grade three it might be six to eight. Jarrad has got a very loose knee joint as it is and we really need to get it scanned to be accurate with our assessments."

Meanwhile, Adelaide's key position strength has taken another hit, with defender Ben Hart expected to miss six to eight matches after it was confirmed he had broken his left forearm.

The injury, sustained in Saturday's surprise loss to Richmond, will leave the Crows struggling for height for a significant part of the season.

Centre halfback Nathan Bock (back) and key forward Ian Perrie (knee) are both set to miss another eight matches, while ruckman Ben Hudson (knee) is out for most of the season.

Pacy Geelong wingman Kane Tenace will have scans on Monday, after injuring his knee medial ligament in Sunday's huge loss to Collingwood at the MCG.

Fremantle key forward Luke McPharlin will also have scans on his injured ankle, after suffering suspected ligament damage in Saturday's win over the Kangaroos.

Melbourne forward Russell Robertson has been cleared of major injury, after it was feared he had broken his jaw in a clash with Hawthorn's Zac Dawson on Friday night.

Robertson is expected to play in the eagerly anticipated clash against West Coast at Subiaco next Sunday.

Port Adelaide pair Peter Burgoyne and Adam Kingsley both suffered hamstring injuries, placing them in doubt for next Saturday night's clash with Essendon at Telstra Dome.

Bombers midfielder Henry Slattery could also miss that match, after he was a late withdrawal from the game against West Coast, injuring his hamstring in the warm-up.

Western Bulldogs utility Mitch Hahn and Sydney defender Craig Bolton also sustained hamstring injuries in last night's game at the SCG.

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