Manchester United discovered a problem with Lisandro Martinez's foot injury

Erik ten Hag admits that Manchester United discovered a "problem" with Lisandro Martinez's recovery from a metatarsal fracture.

Martinez sustained the injury in United's 2-2 draw with Sevilla in the Europa League quarter-finals on April 13 and he underwent surgery five days later.

The 25-year-old returned to the side in the opening pre-season friendly against Leeds United on July 12 but Martinez has struggled for form and he suffered a setback in the defeat at Arsenal on September 3.

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Having started in the defeats to Brighton and Bayern Munich earlier this month, Martinez is now expected to be sidelined for around two months.

"We did a proper diagnosis - in Argentina as well - but now it came out that there was a problem and that's very sad for him and the team, because he was not 100 per cent fit," Ten Hag said.

"I think it was a big difference: the Licha Martinez in the last games and the Licha Martinez we have seen in the first season here at Manchester United.

"He will add to the team, he's a really strong contributor to our levels and if already one player drops a level, then the team performance levels will be lower."

Antony will return to United's Carrington base for training on Saturday now he is available for selection again after a leave of absence.

The 23-year-old voluntarily attended an interview with Greater Manchester Police on Thursday afternoon amid allegations of abuse made by a former girlfriend. Antony denies any wrongdoing.

United have decided to make Antony available for selection again as he has not been arrested, detained or charged by police in England or Brazil, where he has cooperated