Rangers boss Stuart McCall says he feels sorry for Newcastle loanee Gael Bigirimana, but admits he should never have been signed by the Ibrox club.
Burundi-born England youth cap Bigirimana has yet to feature for Rangers after being diagnosed with a mystery illness.
He was one of five Newcastle youngsters signed by former Rangers chief executive Derek Llambias without being put through a medical, even though Bigirimana knew he was sick before signing for the Glasgow giants.
The 21-year-old has denied rumours claiming he is suffering from Hepatitis-C, but McCall, who was appointed earlier this month, confirmed his condition means he will not be able to feature for his adopted club.
The former Motherwell manager would love to have the use of the former Coventry midfielder's services, but believes he should never have been allowed to make the move north in the first place.
"Bigi has got a medical condition which is a personal matter," McCall said. "The doctor and consultant are all involved in that.
"I knew him at Coventry. I remember watching him and thought when I came into the job he will be a good one to bring in and give us a bit of energy. Unfortunately because of his medical condition he won't be able to play for us.
"But that is as big a blow to the kid as it is for us. It's not his fault -- this [row] has been nothing to do with him. He comes in with a smile on his face each morning, he trains with the fitness coach as hard as he possibly can.
"So as disappointed as we are that we can't use him, you have to think of the boy in this matter because he can't go back, he can't play for anyone else. It's an unfortunate circumstance that really should never have happened."
Llambias -- a close associate of Newcastle owner Mike Ashley -- signed off on the five Newcastle loan deals just hours before the January transfer window shut but did not ask club doctors to check the players over.
So far only Slovenian playmaker Haris Vuckic has played regularly.
Defender Remie Streete limped off just half an hour into his debut and has not been seen since, while Northern Ireland winger Shane Ferguson has yet to even set foot inside Murray Park after being ruled out for the rest of the season with a serious knee injury.
Swiss defender Kevin Mbabu has featured for Rangers' youth side but is "nowhere" near being fit enough for first-team duty, according to McCall.
The Gers boss cans sympathise with the players but hit out at the previous regime's decision to sanction some of the signings.
McCall said: "Should these guys ever have been sent here? Well, with Bigi being unable to play that's a no-brainer. With Shane, he was on his way back but had a little setback.
"But I think if you look at it in all honesty, anybody who comes up for a six-month loan should have a medical -- obviously that is not the case.
"If that had occurred, two or three of the loans may not have happened. But none of the players are at fault here. Shane has not been up but the rest come in and train as hard as they can. They are doing their utmost to be involved."
McCall registered his first win since taking over from Kenny McDowall earlier this month with Sunday's 2-0 Scottish Championship triumph over Hibernian at Easter Road.
The former Scotland midfielder will hope the victory can kick-start Gers' promotion drive as they head into the final straight.
Cowdenbeath visit Ibrox on Saturday but McCall warned his players they will now have to match the standards set in Leith last week.
He said: "That result on Sunday will give people belief and confidence. But they need to do it again. The lads have shown what they are capable of and they have got to make sure they stick to that.
"It's been a good week with no midweek game, so we've been able to work on the training ground. Things are looking better but we can't look back. We will take the belief but we need to look forward.
"Cowdenbeath might have lost a few goals in their last few away games, but in our last two games against them we have only managed to score once.
"Nobody will be taking them lightly. They are fighting for their lives and we need to put in a performance that matches the Hibs one."