Shaw, who missed three months this season due to injury and has played only 15 games across all competitions, limped off during United's 2-1 victory at Luton Town on Sunday.

"Further assessment is still required to determine the severity but we expect him to be absent for a few months," United said.

Shaw's injury is a big blow for United who are sixth in the league and chasing a top-four finish. The injury could also impact his chances of playing for England in this year's European Championship.