Huddersfield Town wideman Sean Scannell faces an exploratory operation to pin down the exact nature of the knee injury which will keep him out of a fourth successive game at Brighton and Hove Albion.
The former Crystal Palace player last featured in the first FA Cup third-round clash at home to Reading on January 9.
That was his 21st appearance of the season and 146th in total since joining Town in 2012.
“Scanz is the biggest injury question mark I am facing,” said head coach David Wagner, who has an additional forward option after signing Algerian international Karim Matmour.
“We are not 100% sure how bad the injury is, and it is taking longer than we would have liked.
“At the moment he is not so good, and he may have a small operation so the doctor can take a look.
“We will make a decision over the weekend.”
Wagner will give a fitness test to forward Harry Bunn after he missed Tuesday’s FA Cup replay defeat at Reading with an ankle injury.
“Harry is having treatment and making progress,” said the boss.
“We will have a good look at him when we train before setting off to Brighton.”