The transfer fee of the 25-year-old has been reported at 60 million euros and he will be Jose Mourinho's first signing for the season.
The Brazil global dropped a huge hint that he was Manchester United-bound at the weekend before swiftly deleting a tweet revealing his location.
Winger Douglas Costa trained with the rest of the team for the first time since World Cup preparations began two weeks ago. In the last second, he took advantage of the gap after a 2-0 win over Croatia to define his future.
"A further announcement will be made in due course".
Who is he and what position does he play?
"Man United seem confident they will get it over the line", Bridge told the Transfer Talk podcast before the deal was confirmed.
United fans are unlikely to get much of a glimpse of Fred at the World Cup in Russian Federation, though, as he is yet to start an global under current coach Tite. So it remains to be seen how Fred will cope in the Premier League. Tite said on Sunday: "If I were a coach I would try to sign him too".
Instead, the Portuguese boss intends to play a three-man midfield with Nemanja Matic included. Left-footed, Fred tackles well and hits the killer passes through lines of opponents at which Michael Carrick so excelled, but he's more skilful than Carrick.
United now miss that desire in their midfield, if not in the team hotel the night before games.