He said: "To play against Liverpool in a semi-final always offers motivation.
"But it is significant because I remember my time with Man United.
"When I was there, the Liverpool game was a classic - even though United were always better, Liverpool would always fight tremendously. I don't need to prove anything to Alex Ferguson, but he did not have much confidence in me.
"With more help I could have offered a better performance with United. The English fans did not see the real Forlan, but that was a decision of the coach.
"I don't hold a grudge. That is in the past and since then I have had excellent seasons in Spain.
"But it shows that life after Man United is not the end of football. I am happy and even though I think I should have had more chances with United, it was my destiny to end up enjoying success here."