Diego, the disloyal one: the Brazilian joined from Turin for 15 million euros in 2010 and made 77 appearances, scoring 19 goals. On the final day of 2010/11, with Wolfsburg only one point clear of the drop zone, he left the team hotel without a word after learning he would not start. He was fined and formally reprimanded, and the trust between him and Magath never recovered.
That ego trip effectively ended his Bundesliga career.