Ole Gunnar Solskjaer’s side are edging ever-closer to sealing a £110million deal for the England international.
German runners-up Dortmund insist United must seal the deal by August 10, when their players is expected back for pre-season training.
Sancho, 20, sparked rumours a deal is imminent as he returned to his homeland, and was spotted at a party hosted by rap stars Krept and Konan on Saturday.
However, it is understood no agreement has yet been reached.
And Dortmund’s communications leader Sascha Fligge said there is no problem with Sancho’s return to England as long as it is reported normally.
Fligge said: “It is not unusual and smart for players to move from home before education camp if they are risky.
“The same thing happens to Jadon [Sancho].
“From our point of view, the photographs they have shown us do not violate that way.”
It united the deadline on the German side so that it doesn’t make sense with the window of movement open until October 5.
On Saturday, SunSport reported that gathering Sancho’s exorbitant value, 20, could lead United to blow up his entire group of moves in one player.
That may mean that the movements of other targets, adding Aston Villa captain Jack Grealish, are probably irrelevant.
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