Dele Alli scored after 70 minutes before Toby Alderweireld and Erik Lamela finished United off.
Mourinho has been linked with a move to Old Trafford and reportedly has an agreement in place to take over from the Dutchman.
And Forlan, who played for United between 2002-04, speaking exclusively to 888sport said: "I think with what they have gone through in the past two years United would be better to have a coach with Mourinho’s experience."
Read the full 888sport interview with Diego Forlan here including his thoughts on the Premier League title race and Manchester United's next manager.
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