They are expected to sell quite a few players, with the likes of Marouane Fellaini, Matteo Darmian, Daley Blind and Luke Shaw nearly certain to exit.
But after spending the last two seasons on loan at Besiktas, he is set for another temporary move, this time to the CSL. During his loan spell in Turkey, the Brazilian helped the Black Eagles win the Super Lig title once while also making an impact in Europe.
Arsenal have been linked with a surprise move for the Fellaini, who has made 156 appearances for United over five years since joining from Everton in the summer of 2013. Liverpool and Manchester United, the country's two most successful clubs have, in particular - been quite active in the market whose combined total spending has already crossed the £100-million mark.
But, the continued interest from Manchester United could perhaps be the result of Marouane Fellaini facing an uncertain future at Old Trafford, with reports suggesting that the player is being eyed as a possible replacement.
'If you're chasing a goal you might need to play a different style of football go a little bit more direct up to the front and he's flawless for that.
"It's Mourinho. He wanted Diogo to play for United - that's all the influence that is necessary when a great club and a great manager are both willing to sign him", a source close to the player said.