A clumsy challenge by Celtic substitute Giorgos Giakoumakis on Killie defender Joe Wright inside the box was ignored by referee Willie Collum with the game at just 1-0 heading into added time.
Derek McInnes remains adamant that Kilmarnock were denied a penalty against Celtic in the Viaplay Cup last season as he prepares to do battle with the Hoops once again.
The Greece international - now plying his trade in the MLS with Atlanta United - then tapped in a second to clinch a spot in the final for the Hoops with the Killie boss saying afterwards: "Joe Wright was manhandled. There is no way Giakoumakis can get to the ball but he has come through him, two arms round him. It is a penalty kick.
"Celtic were firm favourites and it is not to say they wouldn't have gone on to win it in extra-time but we did deserve the chance to go to extra-time. I believe the referee was told it was maybe worth having a look at and the referee thought he seen it for what it was, he thought it was a defender trying to buy a penalty.
"We did a lot right in the game, we carried a threat, we played with two strikers, we tried to impose ourselves on the game and that was at Hampden. But you have to do so much right in the game against them to try to limit the opportunities and get the balance between defending and attacking.
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