Answer
Franco Di Santo signed for Schalke 04, a rival of Werder Bremen, in 2015. He was previously a player for Werder Bremen, having joined them in 2011. He was a key player for Werder Bremen, scoring 22 goals in 51 appearances. However, he was not able to agree to a new contract with Werder Bremen, and so he moved to Schalke 04 in 2015.