The Uruguay international admits he had to leave to establish his career.
He told The Sun: “(Louis) Van Gaal gave me the chance to play so I have to say thank you. He is a crazy coach. He was always angry with the players but it was good. I enjoyed it.
“I played 11 matches. I enjoyed every single one. I played one game in the Champions League, I played in the Europa League.
“Playing for Manchester United is amazing. Of course, it was a dream.
“Growing up, it was always about Manchester United, ahead of Real Madrid and Barcelona, because of Diego Forlan playing there. So for a player from Uruguay, it was a dream to play for Manchester United. He was my hero.