Chesterfield could be without Jack Lester for up to three months after the veteran striker was taken to hospital with a suspected broken arm near the end of the goalless draw against Leyton Orient.
Lester was injured in the 82nd minute when he collided with Orient keeper Lee Butcher and referee Gary Sutton angered the home camp by awarding a free-kick against the frontman.
Chesterfield manager John Sheridan was clearly annoyed with the decision and said: "I do not see how he has come up with that."
He added: "The keeper had come right over the top of him and the defender so I don't see how he has given the free-kick against Jack but he obviously sees the game differently to me.
"Jack will be a big loss for us, he's a big player especially at home.
"It's a real shame, he's worked very hard this season but he's a strong character and I'm sure he'll come back as strong as ever - but it's a blow."
Leyton Orient boss Russell Slade defended Butcher after the incident.
In contrast to Sheridan's obvious anger, Slade said: "I feel sorry for Jack but in my eyes it certainly didn't look like a penalty.
"I thought it was two players going for the ball."
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