The Manchester United manager needs to add to his attack for the new season.
The Portuguese manager has taken United back to the Champions League.
De Gea almost joined Real Madrid in the summer of 2015.
A round-up of the latest transfer moves and rumors across the Premier League and Europe.
Mourinho's star midfielder could join his old boss Ernesto Valverde, the new manager of Barcelona.
The transfer window opens officially on June 9.
The forward may be coming towards the end of his Old Trafford career.
United has to reinforce ahead of a Champions League campaign.
Chelsea takes on Arsenal in the 11th final at the north London venue on Saturday.
"There are lots of poets in football but poets don't win many trophies."
The forward will stay at Flamengo in Brazil for two more years.
The match will be played in Stockholm on Wednesday.
The Portuguese is a prolific winner in cup finals and has won the Champions League twice.
Ajax's team had an average age of 20 in its last match.
A place in the Champions League next season is on the line when Jose Mourinho's side meet Ajax. Here's how United made it.
United's final, and now biggest, test comes in the Europa League final against Ajax on Wednesday.
Manchester United needs to win the competition to qualify for the Champions League.
The north London team was champion Chelsea's closest challenger.
The season's showpiece finals are still to be decided.
Antonio Conte's side will face reinvigorated rivals and a tough fixture list.