Speaking to Kicker about the arrival of Bartra, Watze stated, "There is no option to repurchase."
Barcelona often insist on buy-back or first option clauses when they sell home-grown players on. Rumours had suggested that was once again a condition when Dortmund triggered the €8m release clause, but it appears that claim is not true.
At 25 years of age, Bartra is certainly no longer a player that could be considered 'young' and therefore it makes sense that Barça were happy to sever the ties permanently on this occasion.
Having agreed the switch to Germany, the Spanish international, who has five La Liga titles, three Copa del Reys, two Champions Leagues and two FIFA Club World Cups to his name, will now be tasked with replacing Mats Hummels at Signal Iduna Park.
On the separate matter of Mkhitaryan's Dortmund future, Kicker has also revealed that an acceptable offer may prompt the club to sell if the Armenian chooses not to renew his current contract beyond the end of next season.
Arsenal, Juventus and Manchester United are just some of the clubs that have been linked with the former Shakhtar forward in recent weeks and months, and €35m is believed to be the figure that would see Dortmund sell.