Kassos signed for Doxa Drama in 2011 and was loaned out to Prosotsani to get playing time.
[2] He debuted for Doxa Drama on 9 December 2012 in a home win against Ethnikos Gazoros.
[3] Kassos managed to score his first goal for the club on 15 May 2013 in a home draw against Fokikos.
[4] Totally in his two years with Doxa he appeared in 45 matches and scored 7 goals.
[5] On 19 August 2014 Kassos signed for Football League club Iraklis.