Nottingham Forest manager Colin Calderwood is certain to be without the services of striker Nathan Tyson for Tuesday's trip to Carlisle.Tyson, who scored the only goal in Saturday's win over Swindon, is expected to be ruled out of action for over a month after being forced off with a hamstring problem late on in the game.

Calderwood told the club's official website: "I would imagine Nathan will be out for four to six weeks with a hamstring strain or tear."

The Reds hope to be able to call on fellow forward Will Hoskins after he missed the Robins clash with a back problem.

Calderwood can at least call on Grant Holt and Julian Bennett who return from suspension after sitting out Saturday's game.

Ian Breckin could return to the side if the Reds boss opts to revert to three central defenders, as he did for the trip to Leeds.

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