The Bundesliga side are not willing to lower their £108million asking price but Ed Woodward sees that as unrealistic.
Sancho was in blistering form last season, netting 20 goals and providing 20 assists in all competitions.
United are desperate to add him to their squad and challenge Liverpool and Manchester City for the title.
The Red Devils start their Premier League campaign on Saturday when they take on Crystal Palace.
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source: express.co.uk