Cambridge United forward Dan Barton is likely to miss the next couple of months after damaging knee ligaments.
The 19-year-old had to come off during the U’s 2-0 defeat by Lincoln in League One on Saturday and a scan has revealed he has suffered a medial ligament injury.
The club say Barton is set to miss “eight to 10 weeks” with the issue.
The teenager is in his debut season with the U’s and has made 10 appearances, scoring his first senior goal in the 3-3 draw at Bromley in the Bristol Street Motors Trophy in early September.
Cambridge boss Garry Monk told BBC Radio Cambridgeshire that Barton’s injury was “a bit more serious than we would have hoped”.
Monk added: “The time diagnosis would be around eight to 10 weeks, which is a blow for us and a blow to him.
“He was contributing fantastically well this season. It’s unfortunate, but at least it’s a mid-serious one – it could have been longer term.”
Cambridge are currently bottom of League One without a win so far this season as they prepare to entertain Rotherham on Tuesday.