 On 8 September 2017, Sosa moved back to Turkey, joining Süper Lig club Trabzonspor on loan with an option to make the deal permanent until 2020.On 15 January 2018, Trabzonspor exercised the option and paid a €3.4 million fee to Milan.Sosa played for Argentina Under-20 team during the 2003 FIFA World Youth Championship.