Ole Gunnar Solskjaer has provided an update on Marcus Rashford after the forward limped off during Manchester United's 2-0 win at Manchester City.
Rashford made a lung-busting run to prevent a City counter-attack in the second half and appeared to hurt his left ankle in the process.
The Englishman tried to continue but was unable to move freely, prompting Solskjaer to substitute him for Mason Greenwood in the 73rd minute.
Rashford has impressed in a variety of attacking roles this season and has 18 goals and 10 assists to his name. His potential injury comes as a blow to Solskjaer, who confirmed the 23-year-old will be sent for a scan.
Asked about the severity of Rashford's injury, the Red Devils boss said: "I don't know. It's something with his ankle.
"When he sprinted 70 yards to save a goal, it showed the attitude of the boy.
"I think he went over on his ankle but we need to do a scan, I've not had time to speak to the doctor yet."
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Rashford picked up the assist for Luke Shaw's 50th-minute goal, which doubled the lead Bruno Fernandes gave United from the penalty spot in the opening stages.
Solskjaer picked out Shaw and Anthony Martial for special praise after the match, telling BBC Sport: "The second goal was magnificent.
"Luke just showed what he is about. He was a massive doubt this morning and had to go through a fitness test to play. What a performance.
"I thought we defended really well, we were more like ourselves with the ball attacking wise.
"Anthony Martial was man of the match and he was an even bigger doubt than Luke. That was the Anthony we know, strong positive and taking players on. Delighted for him.
"They [Manchester City] are so far ahead you can't really think about anything but making sure we win our games and be better than last year. We were third so we want to move up the table of course."
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