Brighton are hopeful Aaron Connolly will be available as the striker trained on Friday despite heavy bruising on his foot.
Adam Webster's injury remains a concern and Dan Burn is also struggling after the giant defender hobbled off during the 2-1 win at Southampton last month.
South African striker Percy Tau was also ruled out, while Brighton still have long term injuries to both of their first choice wing backs.
Scroll down and click through to see who is struggling to face Manchester United at Old Trafford and when they can be expected to return
1. Adam Webster
The defender was expected to return after the international break but his ankle ligament injury is taking longer than expected to heal. He is hoping to ready for Everton on April 12. "He’s making progress," said Potter. "He hit a bit of a plateau these last couple of weeks. But he has made progress this last week. He’s still a couple of weeks away.".
2. Percy Tau
Represented South Africa in the international break and faces a period of quarantine. "He’s a fit lad and we can help him while he is quarantining. We just have to put up with the fact we haven’t got him for ten days," Potter said.
3. Dan Burn
Ruled out for the Man U game due to his hamstring injury sustained against Southampton. Could be back on April 12 to face Everton. "I think we will probably take a step back at the weekend and aim more for Everton," Potter said.
4. Aaron Connolly
Struggled with back spasms and cracked ribs of late and then injured his foot while on international duty. Will be assessed ahead of Man United. "We’ve had a scan and there’s no break or anything, it’s just a contact on his foot, there was just heavy bruising and he feels better," Potter said.