Bayern also confirmed the transfer, revealing Hummels has penned a five-year contract with his boyhood outfit eight-and-a-half years after departing for Signal Iduna Park:
German outlet DW Sports cited newspaper Bild when reporting a €38 million fee will take Hummels back to Bavaria, where he made just two first-team appearances for Bayern before permanently leaving in 2009.
Bayern chairman Karl-Heinz Rummenigge reacted to Hummels' capture:
Hummels also provided a statement on his move to Bayern, per DW Sports:
Hummels wasn't Der FCB's only acquisition on Tuesday, either, after Bayern earlier confirmed the signing of young Benfica star Renato Sanches:
Following the arrivals of both Hummels and Sanches, the Sun Dream Team illustrated the German giants' initiative in opening their cheque book this summer:
Hummels' move adds extra spice to this season's DFB-Pokal final, which will now see him face off against his future club in what will be his last game for Dortmund.
Bayern will be getting a defender who offers a major threat from set pieces and is comfortable in possession. The latter is a quality incoming manager Carlo Ancelotti will appreciate, as the Italian loves to see his teams keep the ball on deck and work it at pace. Hummels' vision and range will be major assets in Ancelotti's setup.
Securing Hummels' signature gives Bayern a massive boost ahead of next season's Bundesliga title defence, as they are getting a top playmaker at the back while weakening their chief rivals in the hunt for a historic fifth consecutive league crown.
He has played on the biggest stages and thrived, so he'll be up for the challenge that comes with playing at a club expected to deliver at least one major trophy every season.
Tom Coast of Sport Witness highlighted how quickly Hummels' situation escalated in the week leading up to his transfer being announced, attesting to Dortmund's own hand in pushing the deal ahead:
A transfer like this is the type of move title-winning clubs often make. Now Bayern boast Hummels, Jerome Boateng, Medhi Benatia and promising youngster Joshua Kimmich at the heart of defence.
Given the club's injury problems at the back this season, specifically the ongoing absence of Holger Badstuber, Munich now have more options in a vital position.
As for Dortmund, manager Thomas Tuchel will hope former SC Freiburg prospect Matthias Ginter can take a big step in his development ahead of next season.