But the German side are keen to dictate procedures and have given United until mid-August to finalize a deal.
Dortmund boss Lucien Favre wants to know which players he will work with for the coming season.
But United believe they can still seal Sancho’s services beyond the August deadline, the Manchester Evening News reports.
Dortmund are seeking £ 100million for the 20-year-old and, if they were to increase those fees beyond August 10, United are confident they can still get their man.
The complications lie in the structure of the deal with the Red Devils keen to pay lower fees up front – similar to the Bruno Fernandes transfer they made in January.
United want to pay £ 60m initially for Sancho with an additional £ 30-40m.
This would allow them to carry out more summer activities since they will not have spent a sum of nine figures for a player.
Sancho has been a revelation since leaving Manchester’s blue half in 2017 and this quarter has scored 20 times for the German side.
Ole Gunnar Solskjaer has made a conscious effort to add young local talent that further strengthens Sancho’s attraction.
Old Trafford chief Ed Woodward, however, has warned, despite United’s financial strength, that they will need to act appropriately this summer as clubs grapple with the effects of the coronavirus.
He said: “The current disruption of the pandemic – and the economic pressures it has created – has shown why it is so important for football clubs to focus on their financial stability,” he added.
“We are fortunate to have a strong and resilient business activity that has supported long-term investments in our team. This will continue, but with more caution in the months to come as we work our way through this uncertain time. “