The runaway Scottish Premier League leaders crashed out of the Scottish Cup in the fifth round at the hands of Aberdeen on the weekend which follows on from their shock loss to Greenock Morton in the third round of the League Cup in September.
Following the 2-1 defeat to the Dons on Saturday, goalscorer Stokes suggests he is puzzled by why Celtic's brilliant league form has been quelled in the cups.
"I don't know what it is. We've done well in the league but cup games have been different. Yet we don't treat them any differently," he said.
"If I could put my finger on what is going wrong for us in the cups I would tell you.
"I scored on Saturday but it means nothing. It should have given us a foothold on the game but it didn't work out like that.
"It's hard to put a finger on what went wrong. We just didn't play the sort of football we've been playing all season.
"We are disappointed, of course. Every competition we are involved in we set out to try and win it - it's as simple as that.
"We are still unbeaten in the league and want to maintain that as long as possible. But if we put in too many performances like Saturday's then it won't last much longer."
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