Jose Mourinho fears for Manchester United striker Marcus Rashford after he sustains knee injury vs Benfica

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Manchester United manager Jose Mourinho has raised fears over an injury to Marcus Rashford after revealing he was withdrawn against Benfica after feeling 'something' go in his knee.

Rashford made the difference in a tightly-contested Champions League match when Benfica goalkeeper Mile Svilar failed to keep his long-range free-kick in front of the goal line.

Twelve minutes later, Rashford signalled to the bench that he needed to come off and was replaced by Anthony Martial before walking straight down the tunnel with a Manchester United physio.

Marcus Rashford was quickly withdrawn after telling Jose Mourinho he had a knee problem

Rashford walks off the pitch with a grimace on his face after suffering the injury vs Benfica

Speaking to reporters after the match, Mourinho revealed that the 19-year-old told him it was a knee problem as he came off the pitch, leaving him hoping that it is nothing too significant.

Mourinho told BT Sport: 'It is something in his knee. I thought it was cramp or a bit of fatigue but he said it is something he felt in his knee. 

'I hope it is nothing important.'

Manchester United are already having to manage a number of injuries to key players and losing Rashford for a significant period of time would be considered a massive blow to their title chances.

Zlatan Ibrahimovic is said to have returned to first-team training and is thought to be operating at 90 per cent, but he is unlikely to make an appearance before December.

Mourinho has also had to do without Marouane Fellaini, Michael Carrick and Paul Pogba while defender Eric Bailly and Marcos Rojo are also still absent but are expected to return in the present future.

Rashford has scored six goals for Manchester United across three competitions this season and provided four assists. With 10 direct goal involvements, he sits just one behind their most creative player, Romelu Lukaku (11).

The 19-year-old scored the only goal of the game to give Manchester United the three points