Fred was Shakhtar's top tackler last season, averaging 2.9 challenges per game in the Champions League, and played in this holding position as part of a 4-2-3-1 formation in both of the Ukraine club's clashes with Manchester City.
The 25-year-old has been in excellent form for Shakhtar since joining the club from Internacional five years ago so I'm sure the South American will prove to be a superb addition to United's squad.
By signing Fred, Mourinho will be bringing in not only a talented midfielder but a player who can allow him tactical flexibility.
'He is excited to start but now is the time to think about the World Cup.
United will doubtless be delighted to have confirmed the signing of Fred before the start of the 2018 FIFA World Cup, as the deal could have been complicated had he impressed in Russian Federation.
Fred made his Brazil debut in November 2014 and, due to an injury to Luiz Gustavo, was a starter by the time of Brazil's disappointing 2015 Copa America campaign. "Maybe Jose Mourinho has seen something in Fred which he thinks can improve his side".
United have struck deals for Porto right-back Diego Dalot and Shakhtar Donetsk midfielder Fred. In 2015, he tested positive for the banned substance hydrochlorothiazide while representing Brazil in the Copa America.
With Michael Carrick retiring and Marouane Fellaini likely to leave, midfield was one area that needed his attention.
Though he is often compared to his Brazilian compatriot Fernandinho, Fred is a slightly different player, in the sense that he is more attack minded than his counterpart.
"I don't want to be emotional". The player has admitted that his former coach, Paulo Fonseca, gave him the liberty to roam and in turn become "conductor" for his previous team.
"I think Russian Federation has to finish second and the crucial match will be Russian Federation against Egypt", he said.