While denying claims of BVB pricing Sancho out of a move to United, Watzke hinted United's insistence over how the fee would be paid ended negotiations.
He recalled to Kicker: “Jadon might have been subconsciously prepared for a change. I think he had at least thought so much about it that he lost his lightness.
“The alleged transfer fee often mentioned in the media never existed in reality. And if you get a sign at some point that a large part of the sum offered will only be paid in a few years, it will finally be a pure theoretical discussion."
Sancho scored his first goal in seven months for victory over VfL Wolfsburg.
Watzke added: “I have found him trying very hard for weeks, the magic, as Edin Terzic put it, is not back yet, but he hasn't forgotten anything. The biggest difference is: he used to not think about his next passing action. Now he thinks about it."