Queens Park Rangers' fine win over Luton on Easter Monday was marred by an injury to Gareth Ainsworth.
The midfielder was forced off mid-way through the first half of the 3-2 win and was taken to hospital for assessment.
It was initially feared he had suffered a broken ankle, but X-rays have revealed a far more serious problem.
Ainsworth has suffered a spiral fracture of his left fibula and faces a long spell out of the game.
"X-rays on Monday night confirmed our worse fears that Gaz will miss the remainder of the season," R's chief John Gregory told the club's official website.
"However, being the positive person that he is, Gaz reliably informed me he will only miss four games.
"It's a big, big blow for us. He's been inspirational, particularly in the last five or six weeks, where he has turned in possibly his best performances of the campaign."
The injury took the gloss off what was an excellent win which left Gregory purring over the display of Paul Furlong who climbed off the bench to grab the winner, having won a penalty ten minutes earlier.
"A couple of weeks ago we were sat here talking about his missed penalty, so he's gone from zero to hero," said the Rangers boss.
"He was devastated when he missed, a few fingers were pointed at him and he felt he'd let everybody down.
"But football is like that - he's come on as a sub and won the penalty and scored the winning goal, so tonight he goes home quite justifiably the hero."
Luton boss Kevin Blackwell was unhappy with the penalty which was awarded for a foul on Furlong by Markus Heikkinen.
"I thought the penalty was dubious to say the least," he said.
"To be fair to Furlong he's used all his experience to lean on the lad and he's pulled him over.
"These games are too big to be decided by dodgy penalties like that."
Luton are seven points adrift of safety and Blackwell admits he is planning for next season.
"I've got four games left to see the players and decide who I want to be here and who will be departing," he added.
"It was hard to come into the job after the transfer window. I've got 18 players left to pick from. The trouble with Luton is we're too young, we've not got a squad to compete with the other clubs in this division."