The Manchester Evening News says Mourinho will need help stretching his budget this summer.
The United manager has already committed the best part of £70m on Fred and Diogo Dalot - but is a long way off completing his transfer business. He wants a world class centre-back, another midfielder and a versatile forward.
Should he secure all three, he could comfortably treble United's spend in this window, with targets like Toby Alderweireld (Tottenham), Sergej Milinkovic-Savic (Lazio) and Gareth Bale (Real Madrid) commanding massive price tags.
Mourinho's decision to shelves plans to sign a left-back is in no small part down to his extensive rebuilding plans.