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Brendan Rodgers believes his Celtic team "ran out of legs" as they went down 7-0 to Barcelona at the Nou Camp.
The Scottish side were behind to Lionel Messi's opener after just three minutes and when the Argentine completed his hat-trick on the hour-mark, it made the score 5-0.
A Luis Suarez brace in the last 15 minutes rubbed salt into the wounds and Rodgers felt his side's exertions in beating rivals Rangers 5-1 on Saturday told in the end.
"We put a huge effort into the weekend and got a fantastic victory [against Rangers] and it was always going to be tough to play the best team in the world," he said. "In the first half we had a critical moment in the game with the penalty and if you score that it makes it a bit nervy here, after they lost at the weekend.
"But second half we ran out of legs, the game at the weekend added to their immense quality made it very difficult. The scoreline at the end is bitterly disappointing. There are lots of things to learn for our players."
Striker Moussa Dembele meanwhile was philosophical about the penalty he had saved with Celtic trailing 1-0.
"It was a disappointing night to lose against the best team in the world," he said. "But we let them play too much. Next time we won't make the same mistakes.
"You can learn a lot playing against the best in the world. Sometimes you score, sometimes you miss penalties."