"That's why I came here today. Usually I don't talk before a Champions League game, but I thought it was quite important to explain why I do this on the pitch, why sometimes you see my body language, to explain once and for all that it is because sometimes I am really upset with myself. "Everything I do, it has to be done well. Some people think that I'm having a go at someone else, sometimes it does happen, but more often it's because I'm upset with myself. When I am on the pitch and my team are struggling and I know there is expectation on me and I don't do it I am a bit upset with myself, because I know that when I am on a good day I can help the team really well."