Rooney took a knock during Man United's 1-0 win against Swansea. Picture - Reuters.

Manchester United have been boosted with news that striker Wayne Rooney is fit to play in the crucial Champions League group stage match against Benfica on Tuesday.

Manager Sir Alex Ferguson confirmed that the player should be ok for the game, having picked up a knock during the weekend in Man United's 1-0 win at Swansea.

Rooney collided with Swans goalkeeper Michael Vorm and was rested during training on Monday as a precaution, while the rest of the squad was put through their paces.

The Red Devils need a win on Tuesday so as to top group C as they share top-spot in the group at the moment. The winner goes through to the knockout stages while a draw coupled with a loss for FC Basel against Otelul Galati will send both through.

Wayne Rooney got a few knocks on Saturday, he missed training today, but he should be OK for tomorrow, Ferguson said in his pre-match press conference.

Ferguson also expects centre-back Jonny Evans feature on Tuesday but he will without long term absentees Chris Smalling, Danny Welbeck, Michael Owen and Tom Cleverley.