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The Uruguayan has opened up on how Jose Mourinho changed the mentality of the Blues and believes the Red Devils face a tough challenge on Sunday at Stamford Bridge.

The Special One will be returning to his old stomping ground after being sacked by Roman Abramovich last season.

Forlan told The National: "'Chelsea are a small club, nothing like as big as Liverpool or Arsenal,' my captain Roy Keane and other Manchester United players explained when I asked them about Chelsea.

"In my time at United, Chelsea were bought by Roman Abramovich and would go on to become one of the strongest teams in the world.

"Jose Mourinho would also take charge just before I left England. He had become a hero there, taking a 'small club' and making them champions of England for the first time in 50 years.

"Mourinho is loved by Chelsea and can expect a good reception when he returns with his new club – United – on Sunday, even though he is trying to defeat the club who sacked him a year ago.

"Chelsea fans would probably prefer he was not at United. He achieved so much at Chelsea, winning the league in both of his spells there.

(Image: GETTY)

"That is why they will welcome him at Stamford Bridge, even though it is a game that neither he nor his Antonio Conte can afford to lose.

"English fans are good like that and it helps that he is not a player, who could have a more visible impact on the game."

United will look to gain all three points at Chelsea, which would see them leapfrog the Blues in the Premier League table.