Borussia Dortmund want £100m for the England international but United are not willing to go anywhere near that fee.
There has been talk that Sancho has agreed personal terms with United, but those reports are believed to be wide of the mark as negotiations are still ongoing.
And now multiple outlets in the UK are reporting United will start looking at alternatives if Dortmund don't come to the table.
It is believed United would be willing to offer £70m up front and then make up the rest with add-ons.
However, Dortmund are holding firm on their demands and are happy to keep Sancho for another season.
Negotiations have reached an impasse and United may now think it is time to look at cheaper alternatives.