Honestly why do people believe he would want to leave Bayern Munchen, his boyhood club, he loves that club and he is still and important player for them, why would he leave them for us ?
He is like Scholes was for United, like how Gerrard is for Liverpool, how Lampard was for Chelsea, how Xavi is for Barcelona, those players never leave those clubs unless the club wants them out or it is time to retire. We can bid £25m for him, Bayern will just tell us to feck off, Bastian will tell us he ain't interested.
I'd sooner see us sign Vidal or Pogba than I see us sign Schweinsteiger (and I think there is zero chance of us landing either of those 2).