That is the view of sporting director Sebastian Kehl, who spoke about Sancho in midweek.
The English winger helped BVB reach the Champions League final with a 2-0 aggregate win over Paris Saint-Germain.
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"We will see," Kehl told TNT Sports ahead of the second leg.
"They are on loan (Sancho and Ian Maatsen of Chelsea), both of them, and at the end we need to make any decisions.
"Of course they are under contract with their clubs, that means we will at a specific moment get in touch and then we will see if it's possible or not. I know that the players feel pretty welcome in Dortmund, they feel at home, especially Jadon.
"I think it was a quite good decision to take them," Kehl continued.
"But again, this is something for the future, and let's keep our focus on today."