 During the winter break, VfL Wolfsburg offered an estimated € 4 million for Diekmeier, which eventually did not amount to a transfer.Instead, Diekmeier ended up signing with Hamburger SV in July 2010, whose home games he had attended as a child and whom he had supported since childhood.Because of an injury, he made his first appearance for HSV on 19 March 2011 in a 6–2 home win over 1.