 Because Sousa did not rely upon Díaz, he was forced to leave the club during the winter break.On 2 February 2015, Díaz signed for German Bundesliga club Hamburger SV on a three-and-a-half year deal.On 1 June 2015, he scored his first goal for the club in its relegation play-off match which took place at the end of the 2014–15 Bundesliga season, against Karlsruher SC.