The Uruguayan, who played for Sir Alex Ferguson's side between 2002 and 2004, went on to play in South America for Internacional a decade later.
Whilst at the Porto Alegre outfit, he lined up alongside a certain young Brazilian making his breakthrough in the senior game and the pair even combined for a couple of goals.
Forlan set up Fred for a strike against Palmeiras in October 2012 and, the following May, Fred claimed the assist for a Forlan goal away to Vitoria.
Forlan, who is returning to Old Trafford for the first time to play in the Legends of the North charity game against Liverpool on 21 May, enjoyed working with his fellow South American as he eagerly tried to make his mark.