Stack was replaced on 73 minutes by Mark Brown after suffering a thigh injury and is facing a battle to recover for next month's final against SPL champions Celtic or arch-rivals Hearts.

Leigh Griffiths' late winner saw off Aberdeen in the semi-final and Stack is waiting to learn how serious his injury will prove to be.

"I will go in on Monday and have a scan and fingers crossed it is not too bad," said Stack.

"Of course it is a worry, no one likes missing games, certainly not the ones we have coming up - a relegation battle and cup final on the horizon.

"So I will be trying my utmost to get myself fit."