It comes as Manchester United grow more desperate for the England international with time running out.
The Red Devils have tried to whittle the price down for Sancho this summer.
But Dortmund have not even come to the bargaining table, simply telling Ed Woodward that unless they fork out £109m, he is going nowhere.
Sancho is happy to stay in the Bundesliga for another season and has a contract there until 2023.
United had hoped that with time running out in the transfer window, Dortmund's stance would ease.
But it appears the reverse has happened and according to Bundesliga football expert Kevin Hatchard, Sancho's price could go north.
He tweeted : "Been told today there is no prospect of #bvb lowering their valuation of Jadon Sancho, which is believed to be around 120 million euros, and there is even a possibility that they may ask for more.
"As I’ve said for weeks, if #mufc strategy is to pressure Dortmund, it’s failing."
It will come as a huge blow to Ole Gunnar Solskjaer, who had made the 20-year-old his top target going into the window.
United would be taking a huge gamble by allowing themselves to wait another year before launching another raid.
Amid the Covid-19 crisis, the Red Devils are one of the few clubs that have been hit relatively less hard.
The major clubs such as Real Madrid and Barcelona have been unable to enter the transfer market.
And prior to the coronavirus crisis, they had taken an interest in Sancho and would likely revive their efforts next year when their financial outlay is more secure.
Meanwhile, United legend Gary Neville has told his former club to snap up as many as four players before the window is closed.
Speaking to the Webby and O’Neill YouTube channel, Neville said: "I think the left-back area is important because Luke [Shaw] has had injury problems.
"I think centre-back is critical and I do think at least one forward is important. I still think we need three or four signings.
"I’ve got a feeling they [the Manchester United board] are on it and are just not getting them over the line quite as quickly as they’d want.
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"But they’re not panicking and they’re still in control I think.
"They’re not reacting to the market like they were a few years ago, they’re in control.
"The signings are better, they’re a better age-profile and look like they will be at the club for a long time rather than a season or two. ‘I’m positive generally about United, but getting those players over the line is critical."