The 25-year-old has signed a five-and-a-half-year contract, with the option of a further 12-month extension, in a deal worth an initial £46million. The long-anticipated deal was finalised on Thursday after Fernandes, who has 19 international caps, agreed personal terms and passed a medical.
Fernandes said: “My love of Manchester United really started when I used to watch Cristiano Ronaldo play and ever since then I have been a big fan of this great club.
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“For me to now play for Manchester United feels incredible, I have worked hard to get to this moment and I can promise the fans that I will give everything for the badge to help bring us more success and trophies.”