Carlton fear Brad Fisher may need a knee reconstruction after Saturday night's AFL NAB Cup loss to Sydney.

Scans on Monday will determine the extent of the injury and if he has ruptured his anterior cruciate ligament, it would be a major blow to the Blues.

A reconstruction would most likely put Fisher out of action for the rest of the season.

Fisher is supposed to be part of the new-look Carlton attack that is developing in the wake of Brendan Fevola's departure to Brisbane.

The Blues issued a media release on Sunday, confirming that Fisher would undergo scans on his right knee after the second-term injury.

Meanwhile, Melbourne have also suffered an injury blow, with second-round draftee Luke Tapscott to be out of action for up to four months.

The 18-year-old will need arthroscopic injury on his hip.

He twisted the hip at training before Christmas and the pain recurred last week.

"It was decided the best course of action was for Luke to undergo surgery now in order to repair his torn labrum, so that he can rehabilitate fully, and return to playing football by mid-season," the Demons said in a statement.

Melbourne football manager Chris Connolly added: "We value Luke highly as a player, and although this injury is disappointing, it will give him the best chance to continue his development and play quality football in the second half of the season."

The Demons recruited Tapscott with pick No.18 in last year's national draft.

He is a midfielder and half-forward from SANFL side North Adelaide who made last year's under-18 All-Australian team.

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