The 18-year-old Frenchman was filmed on crutches, with his left foot in a protective plastic boot, boarding a bus at United’s LA training base at UCLA on Wednesday. If the worst case scenario is confirmed and Yoro has suffered a fracture, it would rule him out for the start of the season and until late September at the earliest.

Yoro sustained the injury just after the half-hour mark against Arsenal and limped off immediately after receiving treatment. Yoro’s injury and expected prolonged period out of action is likely to accelerate United’s efforts to bring in another centre-back, with Victor Lindelof set to leave before the window closes.

Raphael Varane has already departed, joining Serie A side Como following the expiry of his United contract. Young defender Willy Kambwala, who deputised on a number of occasions last season, has left for Villarreal in a permanent move.

Ten Hag’s team will return home from their US tour in time for the Community Shield at Wembley on August 10. The league opener against Fulham comes just six days later.

“How badly will Manchester United miss Leny Yoro? This is such an important time for us as a group, to put the work in, to work at a few different things we’re going into the season trying to do,” Mount told club media during the pre-season tour.

“We don’t normally get loads of time to prepare for games during the season. You have maybe a few days if you’re having two games a week.

So now we have an extended period of time where we can work at things together and build something. That’s definitely what we’ve been doing over the last two weeks and then obviously coming out here.

So ramping it up, really feeling good in the group and there’s a really good vibe.”

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