Career
He is 2.03 m (6"8") tall, and he can play at either the small forward or power forward position, with small forward being his primary position. Karathanasis began his basketball career playing with the youth clubs of the Asteria Basketball Academy in Thessaloniki, Greece. He joined the Greek League power Olympiacos in the year 2008, and played with their youth clubs, before going on loan to the semi-pro Greek 3rd Division club Mantoulidis, for the 2009-2010 season.
He began his pro career in 2010, when he joined the Greek League club Panellinios.
In August 2011, he signed with the Greek League club Kavala. In September 2014, Karathanasis signed a contract with Aris for the 2014-2015 season.
On September 15, 2015, he was officially signed by Aries Trikala British Columbia for the 2015-2016 season.