Cambridge United believe they have identified the nature of the ongoing problem that has sidelined midfielder Adam Miller for 13 months.
Miller, 29, has had two operations on his ankle following a severe injury picked up last August.
He will now see a medical specialist who has told the club he is confident of a successful recovery.
"That specialist expects the problem to be resolved," boss Jez George told BBC Radio Cambridgeshire.
"I'm just advised by the medical people who say 'we've hit a problem, we've now gone to another specialist to get that problem resolved'.
"It's a long process, it was a very serious injury, it's important people realise how well the club's looked after Adam."
The length of Miller's absence, initially expected to be six months, is unknown.
Meanwhile, George has suggested winger Conal Platt could be on his way out of the club.
The 24-year-old has scored twice in five appearances this season, but the arrivals of Harrison Dunk and Peter Winn have created more competition for a left-flank place.
"His attitude has been first class, he's done everything we've asked him to do," George explained.
"But perhaps at this moment in time, the way he plays, his attributes don't quite fit what we're looking for.
"That's something we've spoken to Conal about, he understands the situation, it's an ongoing thing and we'll talk about it with Conal next week."