Career
Previously he played, on loan from Iraklis, for Aiginiakos. Tsilianidis has been a Greece U-17 and Greece U-21 international. Kosmas Tsilianidis began playing football for Achilleas Triandria.
After a year having scored a number of goals, Tsilianidis was noticed by Iraklis and in April 2005 was transferred to the youth ranks of the club
In 2011 he was on trial in Fulham. He made his first team debut in Iraklis" away draw against Nea Kallikrateia.
Tsilianidis was loaned out to Aiginiakos during the 2013 winter transfer window. He debuted for Aigianiakos in an away draw against Kassiopi and scored his first goal in a home draw against Odysseas Kordelio.
Tsilianidis returned to Iraklis after his loan period ended.
Foreign his performance in the 2013-2014 season, he was named as Football League North Group"s best young player. Tsilianidis has been capped for Greece U-17. On 29 March 2015 he debuted for Greece U-21 in 0–2 home defeat against Croatia U-21.
