"They were behind the times for long stretches of the game against an opponent who is mediocre at best in Europe.

"They will have to improve enormously", he added.

Celtic were expected to struggle badly against Bayern Munich in the knockout playoff phase, but the Scottish champions proved they could hold their own against one of the favourites to win the competition.

Now Brendan Rodgers will want to build upon that next season, when the Bhoys will again want to make a splash in the Champions League.

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