Dundee United boss Peter Houston has slated referee Iain Brines for what he feels is a case of mistaken identity for the sending off.
Substitute Jennison Myrie-Williams was given his marching orders for a second yellow card for persistent fouling, having only been on the pitch for 14 minutes.
Houston is furious with the decision, believing the referee thought he was speaking to United team-mate Prince Buaben.
"It was unbelievable," he said. "He got the wrong guy, let him come out and say it.
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He had spoken to Prince Buaben minutes before that after a tackle and said, 'If you do that again you are going off the park.'
"I think he thought it was Prince.
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I thought it was really poor.
When you start pointing all over the pitch for persistent fouling - to a guy who has been on the pitch for five minutes - he got it wrong.
"Myrie-Williams never left the touchline because I was shouting on him to do get over this side.
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It will be interesting to see what his report says."