He paper reports that as Dortmund are interest in signing Fernan Torres from Valencia, they are already looking to replace Sancho.
Torres is a winger, and he would take Sancho's place in their squad if the Englishman wants to move on.
Sancho is wanted by United and Chelsea, while other English clubs also retain some interest in the player.
Dortmund chief executive Hans-Joachim Watzke said last week: "You always have to respect what the player wants.
"We already said before corona that our preference is for Jadon to remain with us.
"I can say clearly that even the very rich clubs, despite the current crisis, shouldn't think they can get a bargain from us.
"We don't have to sell anyone below their value."