#2 Mats Hummels to Bayern Munich for £28m
Mats Hummels started off in Bayern Munich’s youth academy as a six-year-old and signed his first professional contract in 2006 but only managed to make a single appearance for the club before being loaned out to Borussia Dortmund where he made his name.
Hummels eventually signed for Dortmund in 2009 and spent seven years at the club making over 200 appearances for them. The defender was also a key element of Jurgen Klopp’s side that trounced his former club Bayern to the league title in 2010-11 when he was paired alongside Neven Subotic as the first choice centre-backs. With the duo at the back, the club registered the best defensive record in the history of Bundesliga.
Hummels signed an extension with the club after their domestic double in the 2011-12 season but on 10 May, 2016, it was confirmed that the player would be joining his former club following in the footsteps of former teammates Mario Gotze and Robert Lewandowski.