The Netherlands international has been omitted from the Red Devils squad which left for their USA tour this weekend.
A £18.5m deal is in the final stages of being agreed between the two clubs, leaving United with a £4m profit after Blind’s four years at Old Trafford.
Jose Mourinho told the Dutchman that his time with United is over as the Portuguese looks to strengthen his defence. Having been a first-choice under Louis Van Gaal, Blind finds himself having made a total of 30 Premier League appearances in the past two seasons.
Last season’s Premier League runners-up are eyeing a move for AC Milan Leonardo Bonucci, 31. The former Juventus man has spent one year with the Rossoneri after leaving Turin and is valued at £30m by the English club. Manchester City were previously heavily linked with the Italy international.
Tottenham’s £70m valuation of Toby Alderweireld has all but killed a deal for the Belgium international with the north London club set to lose the player for £25m when a release clause in his contract activates this September. United are expected to return for the centre-back in the January transfer window.