Brazilian international midfielder Fred completed his move to the team he says are the "biggest club in the world" Manchester United for a reported £50 million ($67 million) on Thursday June 21,2018"This is the biggest club in the world and I am delighted to be a part of this amazing team," Fred told the United website.
"To work with Jose Mourinho, who has won so many trophies in his time as a coach, is an opportunity not to be missed.
"I cannot wait to get started and to meet my new team-mates.
"This is a very exciting time for me with my focus now fully on the World Cup with Brazil."
Mourinho, who has also signed Portuguese full-back Diogo Dalot from Porto, said Fred would add a missing component to the midfield.
Fred will hope to make the same impact on the Premier League as Brazilian international team-mates Willian and Fernandinho, who also arrived in England via spells with Shakhtar.
He was banned from international football for a year by South America's governing body CONMEBOL, but only missed four months for Shakhtar as FIFA did not extend the ban to cover all confederations until February 2016.
Fred did not return to the national team until a 3-0 friendly win over Russia in March.