Martinez was taken off on a stretcher during United’s 2-0 defeat at home to Crystal Palace on Sunday, with Ruben Amorim admitting it looked a “serious situation”. It is unwelcome news for the United boss, who has struggled to turn things around at the club since replacing Erik ten Hag in November.

Manchester United trio Harry Maguire, Kobbie Mainoo and Bruno Fernandes will have to tread carefully when Leicester City visit Old Trafford in the fourth round of the FA Cup on Friday night. United booked a fourth round date with the Foxes after beating Arsenal on penalties in the third round at the Emirates Stadium last month.

Manchester City U18 6 (Warhurst 4’, 42’; Heskey 20’, McAidoo 57’, Gorman 65’, Fletcher 87’)Leeds: Kenyon (GK), Firth, Bird,