A statement on the club's official website says: "Manchester United is delighted to announce it has reached agreement with Shakhtar Donetsk for the transfer of Frederico Rodrigues de Paula Santos (Fred)".
But before he links up with the rest of the squad later this summer, United fans will be able to catch a first glimpse of Fred in action for Brazil at the World Cup.
The Premier League campaign will kick off on Saturday, August 11. Still only 19, the right-back only made his Porto debut in February but he's done enough in the months since to convince Mourinho he has a bright future at United.
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Brazilian midfielder Fred will need time to adapt to the demands of English football but has all the attributes to succeed at Manchester United, former World Player of the Year Rivaldo has said.
Fred caught the eye in Shakhtar's run to the last-16 of the Champions League, where the Ukrainians only lost out on away goals to Roma.
Fred made his global debut for Brazil in 2014 under Dunga and was called up for the 2015 Copa America following an injury to defensive midfielder Luiz Gustavo.
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HD Cutz, normally based in Battersea, London, sent a barber up to the Brazilians' hotel in Liverpool and the firm posted several clips and pictures of the players after their haircuts.
Mourinho loves a midfield terrier and Fred is about to be a red...
Fred did not return to the national team until a 3-0 friendly win over Russian Federation in March and Tite was keen for his transfer to be completed before the World Cup starts on June 14.
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