Manchester United might have thought they’d seen the last of their £34 million forgotten man. Or, at least, they’d have hoped they’d seen the last of him. The sight of the Old Trafford misfit returning then, perhaps for the first day of pre-season, will provide a rather stark reminder of the substantial clean-up job facing Ineos following their seizing of control of all football operations. Manchester United included an option-to-buy clause in the midfielder’s contract when they sent him out on loan during the January transfer window. But with Donny van de Beek struggling at Eintracht Frankfur…