Manchester United will host Celta Vigo tonight (20:05 GMT) for the second leg of the Europa League semi-final. The Spaniards are at a disadvantage after losing 0-1 at home, but they hope to take Mourinho's team by surprise...
The Red Devils are virtually out of the Premier League top four with three matches to go and a four-point deficit separating them from Guardiola's City. The Europa League is their last chance to try and make it into the Champions League next season.
The competition, which was seen at first as an unnecessary distraction by the club, has gained importance as the season unravelled, and it is now the vital difference between a potentially mediocre season and a successful one.
Mourinho's men will try to defend their win at Vigo last week (0-1), well aware of the home advantage they possess. In the Europa League, six wins out of six matches at Old Trafford act as a testament to their supremacy at home.
Celta travel to Manchester dreaming to turn the result around, with yet another challenge this season for Berizzo's side. They will trust their goalscoring abilities in order to shock the main contender to the title.