Grabara dropped a clanger at 2-0 as FCK lost the Champions League clash 3-1 on the evening.
The former Liverpool keeper later said: "It wasn't ideal. I can be extremely proud of our performance as a team and I can say to the boys playing in front of me that they were much better than the game at the Parken, but I can't say that about myself.
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"You have to be blind not to see that I cost a goal. I couldn't have chosen a worse game to do it."
City won the round 16 tie 6-2 on aggregate.