After Celtic were thumped by Barcelona 7-0 at the Nou Camp on Wednesday morning (AEST), manager Brendan Rodgers believes it could have been a different story had things gone their way in the 24th minute.

Lionel Messi opened the scoring inside three minutes, but Celtic looked to have a way back in the match after Moussa Dembele was fouled in the box giving the Hoops a penalty.

Dembele stepped up, but his relatively tame effort was turned away by Barca goalkeeper Marc-Andre ter Stegen, and the home side then went on score another six in their rout of Celtic.

โ€œMoussa was happy to accept the responsibility and the keeper read it and made a good save," Rodgers said.

โ€œThat was a moment for us that needed to go our way. When the ball hits the back of the net for us it would have given us a lot of energy so I think that was a turning point.โ€

Despite the result being Celtic's worst ever loss in European competition, Rodgers was adamant his side would take valuable lessons from the match.

โ€œWe couldn't have come to a more difficult place in world football. This will be a brilliant learning season for us in the Champions League," Rodgers said.

โ€œEven the older ones will learn from that and that will make us a better team. Tonight is one of the tough nights that you take at this level.

โ€œThere can be no embarrassment as they do that to better teams than us. Professionally it is never nice when it happens. We gave away the goal early but I thought we came back into the game.