It was revealed on Wednesday that United and Dortmund had agreed a fee of around £73 million for the winger.
Thursday then saw Dortmund make an official announcement confirming the transfer.
Depsite Sancho still costing a pretty penny, Dortmund are upset as they valued him at a much higher price.
The German outfit stood firm on a valuation of £108 million last summer, but decided to accept less as Sancho was desperate to return to England.
Watzke said in a press conference per Metro: "We're not happy about the money.
"We're sad that he's gone. At the end of the day, it was Jadon's exemplary wish to leave, we would have preferred to keep him here.
"But he behaved fantastic and gave everything for four years. He made us move forward significantly in the second half of the season."
Sancho joined Dortmund from Manchester City back in 2017 at the age of 17.
He helped the club to a third placed finish last season and won the DFB-Pokal.
Sancho will sign a deal until 2026 and all that is left is for him to pass a medical, once England's Euro 2020 campaign is over.
There is currently no news regarding the number he'd be wearing, with many fans assuming it'll be the number seven.
Edinson Cavani currently wears number seven and became a cult hero among fans after arriving as a free agent last summer.
An official United statement reads: "Manchester United is delighted to announce it has reached agreement in principle with Borussia Dortmund for the transfer of Jadon Sancho.
"The signing is subject to contractual terms and a medical, which will be completed after Jadon's involvement in the UEFA European Championship."
United finished second in the Premier League last season and 12 points behind rivals Manchester City.
Manager Ole Gunnar Solskjaer is aware his squad needs reinforcements and he's previously said: "If we want to take up the challenge with City, we need to strengthen our squad."
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Featured Image Credit: PA Images
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