Carlton is unable to declare how severe a shoulder injury to experienced utility Matthew Lappin is.

Lappin injured his left shoulder during a collision with Sydney's Brett Kirk in Saturday night's AFL game at Telstra Dome, and underwent X-rays at hospital, which were inconclusive.

The Blues have sent the 217-gamer for further scans, with the results not expected until Monday, although Lappin is in some doubt to play Hawthorn in Friday night's round four opener.

Carlton is also sweating on a report against full-forward Brendan Fevola, who was booked for rough conduct for bumping into Kirk in the third quarter.

Geelong is another club faced with injury and tribunal worries.

The Cats lost captain Steven King (hamstring) and defender Matthew Egan (shoulder) during Saturday's loss to the Hawks, and also have defender David Johnson on report, for striking Luke Hodge.

King could be sidelined for up to three weeks, while Egan is unlikely to play the Western Bulldogs on Saturday.

Egan's likely absence will compound Geelong's current shortage of big defenders, as fullback Matthew Scarlett still has another game to serve suspended, while centre half-back Tom Harley is not expected to return from a knee injury until round five.

"He's just finishing off extensive rehab and round five is when he's expected back," said Cats football manager Garry Davidson of Harley.

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