The 'Red Devils' have been in pursuit of the Brazilian for some time, but after a medical was completed on Monday, the club announced the agreement through their official Twitter account.
Their statement was brief and didn't reveal any details as to the transfer fee or contract length but did state that "a further announcement will be made in due course".
Fred signed for Shakhtar in 2013 from International and has since made 101 appearances, scoring 10 goals in the process.
He will be a welcomed addition to United's midfield as Jose Mourinho has already stated on numerous occasions his wish to bolster the position this summer.
5 June 2018