Bayern Munich star Arjen Robben has apologised for his reaction to being substituted in Wednesday's 1-0 victory over Lyon in the first leg of their UEFA Champions League semi-final.
The Dutchman has been in excellent form this season and his match-winning strike against Lyon in Germany followed decisive goals versus Fiorentina and Manchester United earlier in the competition.
Robben was substituted after putting Bayern in front against their French opponents and he reacted petulantly by refusing to shake manager Louis van Gaal's hand as he left the field.
The pair had a face-to-face confrontation on the touchline but, having discussed the issue with his boss, Robben has since accepted that his behaviour was unacceptable.
"I had a really good feeling and felt I was really in the game and I could have scored another goal," said the former Real Madrid man.
"Therefore, I could not understand why I was being removed.
"But I have got to apologise to all of the fans because I shouldn't do that. I should have been more professional, but this is just part of my mentality - I always want to win."
Van Gaal insisted Robben had been taken off to preserve him for the weekend Bundesliga clash against Borussia Monchengladbach.
"We need him to score goals for us in Monchengladbach too," he said.