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Manchester United were dealt an injury blow in their Champions League clash at Benfica as Marcus Rashford limped off.

England striker Rashford had given United the lead when Benfica keeper Mile Svilar carried his free-kick over the goal line.

But he was in some discomfort towards the end of the game, and was replaced by France international Anthony Martial.

BT Sport cameras showed him looking concerned as he spoke to boss Jose Mourinho on the touchline before heading into the changing rooms.

(Image: Action Images via Reuters) (Image: Getty Images Europe)

Speaking about the injury on BT Sport, Mourinho said: "It's something in his knee, I thought it was cramp, a bit of fatigue, but it's his knee. I hope it's nothing important."

Rashford returned to the starting line-up for the Red Devils following their 0-0 draw with Liverpool, as they made it three wins from three in the Champions League.

The teenager featured on the left for the away side, while £75million summer signing Romelu Lukaku took centre stage.

(Image: REX/Shutterstock) (Image: REUTERS)

Mourinho, who is currently without a number of first team players, will have been disappointed to have seen the youngster make way late into the fixture.

Paul Pogba is still missing with an injury picked up against Basel while Marouane Fellaini is also out for the Old Trafford side.