Manchester United must wait to find out the extent of the groin injury sustained by Raphael Varane on international duty.
The Frenchman went down in the first half of France's 2-1 win over Spain in the Nations League final, and was subsequently withdrawn by Didier Deschamps before the break.
Varane will be assessed by United's medical staff on Tuesday and will undergo a scan, which should help to determine how long he may be on the sidelines for.
ESPN note that United are facing an 'anxious wait' about Varane's injury because of other issues manager Ole Gunnar Solskjaer is encountering. Harry Maguire is already on the sidelines recovering from a calf problem, meaning there will be starts in central defence for Victor Lindelof and Eric Bailly against Leicester on Saturday should Varane not be passed fit.
The Red Devils remain 'hopeful' at this stage that he will be fit enough to play, but the results of the scan will be key in determining whether there is any risk associated with playing him.
Varane has settled into life at Old Trafford nicely after his summer move from Real Madrid. Indeed, the 28-year-old recently spoke of his excitement at getting out of his comfort zone by challenging himself in the Premier League after a lengthy spell in the Spanish capital.
"I am very happy with this beginning of the adventure. The Premier League is a Championship renowned for its intensity," Varane said. "There is a different atmosphere, a different mentality in general in relation to football. It's a different approach and a different experience for me.
"I enjoy playing, getting out of my comfort zone, looking for new benchmarks in relation to my teammates. It's another way of defending, it's super interesting for me."
Results have not necessarily complemented Varane's enjoyment of his new surroundings with United struggling to string together any kind of consistency.
They are within touching distance of table-topping Chelsea in the Premier League, but have been sloppy in other competitions - surprisingly losing to Young Boys in the Champions League as well as being dumped out of the Carabao Cup by West Ham.