The Daily Mail says United intend to splash out big this summer on their engine room after doing the same last year on their attack.
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A left-sided winger is in the plans, along with the two midfielders, plus a left-back and potentially a new centre-half.
United management have decided to draw up a lengthy list of transfer targets and make a formal move only after the manager's position is confirmed.
For the moment, caretaker Michael Carrick remains a candidate and has a big chance of landing the position long-term if United finish in the Champions League qualifying places.