Mourinho was impressed by striker Lewandowski, but felt Madrid did themselves no favours when it came to dealing with the Poland international.
"When we know everything, absolutely everything about Lewandowski - we studied every detail possible and we lose him in three balls - and we know exactly what he does, and it is of course very disappointing," the Portuguese said.
"When I lose and I don't deserve to lose, for me it is a problem. When I lose and I deserve to lose it's a situation that I accept.
"The first goal we lost the ball in easy possession and after that we lost the player. His movement in the box, we know everything about him, so of course he deserves credit for what he did but we gave him a big support for him to be the man of the match."