"Even though we lost, I am very proud of my team. We played with 10 men for much of the game. Despite that we continued to dominate possession and play an aggressive game. But that sort of thing happens. Tonight is a big lesson for us. This is a group game, if it happens in the last 16 onwards then you are out of the competition," Guardiola said.
Manchester City beat Bayern Munich 3-2 at the Etihad Stadium here Tuesday.
"If you look at the way we played you can't say that we lacked focus. I feel sad for the players, perhaps we were a bit tired in the end and that was a bit disappointing. Obviously with a player like Sergio Aguero he is always going to pose a danger but that is football."