Sandro, was tipped to sign for United in the January transfer window, however, a deal wasn't agreed.
Fred has the power and tenacity to form a solid double-pivot with Nemanja Matic when Jose Mourinho sees the need to manage the game, but it would be simplistic to describe him as a holding midfielder.
Mourinho is aiming to build a team capable of challenging for the Premier League title next season after the Red Devils finished second and without a trophy last term.
According to Manchester Evening News, the Portuguese boss still wants to sign a new left-back to replace Luke Shaw, a centre-back and another attacking player.
Brexit 'meaningful vote' rejected as PM strikes deal with Tory rebels
Britain's Prime Minister Theresa May returns to Downing Street from the Houses of Parliament in London, Britain, June 12, 2018. But government officials admitted that the concession does constrain their freedom in the Brexit talks.
Since joining Shakhtar in 2013 from Internacional, Fred has grown into one of the most sought after midfielders in Europe; United have done well to finalize a deal.
United will also be looking to improve on last season's UEFA Champions League form, following their shock round of 16 loss to Sevilla.
Whoever arrives at the club this summer will become the sixth centre back to be on the United books at this point in time, and Mourinho doesn't plan on selling any others unless they request to leave.
A number of stars have been touted to make the move to Old Trafford including Juventus full-back Alex Sandro, Real Madrid defender Raphael Varane and West Ham star Marko Arnautovic.