Manchester United fear Paul Pogba will be out injured for at least four weeks in a huge blow to manager Jose Mourinho.

The France midfielder was substituted 19 minutes into United’s 3-0 win over Basel at Old Trafford on Tuesday after stretching awkwardly to win the ball in a challenge with Mohamed Elyounoussi and injuring his left hamstring in the process.

Pogba is thought to have undergone a scan on Wednesday but United are not expected to know the full extent of the damage until he has undergone further tests.

Around a month on the sidelines is thought to be the best case scenario but it could be up to six weeks if the worst fears are realised.

Pogba was struggling to walk after the game. He is also thought to have felt some discomfort to his left thigh and left Old Trafford on crutches.

A month out would rule Pogba out of the Premier League games against Everton, Southampton, Crystal Palace and Liverpool as well as the Champions League game away to CSKA Moscow and the League Cup third round tie at home to Burton Albion.