Ryan Christie has either suffered a broken eye socket or a broken cheekbone, according to manager Neil Lennon.
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The Celtic midfielder saw his semi-final in the Scottish Cup before half-time after a fierce clash with Dominic Ball end.
The Aberdeen defender was too late with an air challenge and hit Christie in the face with his forehead.
A second yellow card was shown by referee Craig Thomson. The Dons were later reduced to nine men after Lewis Ferguson had shown a red card for a two-shot failure by Tom Rogic.
In a conversation with BBC Scotland, manager Neil Lennon said: "We saw him at half-time and he was conscious. We think it's either a broken eye socket or a broken cheekbone.
"It was a terrible coincidence, and I do not think there was any consideration. It was a definite second yellow. "
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