Brighton and Hove Albion are facing "a few weeks" without the services of young Tariq Lamptey.
The star wing-back suffered a setback in his recovery from a hamstring problem.
He had already been ruled out of the third-round FA Cup tie at Newport County on Sunday night.
Brighton manager Graham Potter revealed after the game that Lamptey's absence looks set to extend further into a busy January schedule.
"On the back end of his rehab he just felt the hamstring," he told theargus.co.uk
"He will probably have to take a couple of steps back, which is disappointing for us and obviously for him.
"It means he is going to be a few more weeks yet. That’s disappointing."
Lamptey has not featured since going off injured in a Premier League fixture at Fulham FC last month.
The 20-year-old has since missed four matches.