The midfielder insists the Hoops can't let cup elimination turn into a full-blown form slide.
Callum McGregor has warned his Celtic peers they are at the same point as when Ange Postecoglou endured a bumpy start to his Hoops tenure.
Marley Watkins goal sealed a shock Hoops elimination on a flat day for the champions and McGregor has told Celtic TV it's a result that can't spark a sorry run. He explained: "Not good enough. Celtic teams, you need to play with a certain level of personality and quality. We didn't do that. I think it is a reminder for everyone you don't have a God-given right to turn up and win Trebles. It is not easy.
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