The England star is United's number one target in the summer transfer window, after the Red Devils spent all of last summer chasing him as well.
According to talkSPORT, the German giants have set a £77 million plus add-ons price for Sancho.
That is described as a "take it or leave it" price that cannot be negotiated.
Sancho has already agreed personal terms with United and would be happy to make the move.
The youngster spent his formative years in the Manchester City academy.