Marcus Rashford limped off during Manchester United's latest match in the pre-season tour in the United States in another potential blow for manager Erik ten Hag.
The Man United boss had already seen his forward options reduce ahead of the new season with Rasmus Hojlund ruled out for six weeks with a hamstring injury.
Ten Hag will now be left sweating over the fitness of Rashford after he was forced off in a 3-2 friendly win over Real Betis.
The 26-year-old was brought off just after the hour mark at the Snapdragon Stadium in San Diego.