In round 1 of the 2000 NRL season, Georgallis played for the Wests Tigers in their inaugural game against Brisbane which ended in a 24–24 draw.
[10] On 20 June 2011, it was announced that Georgallis would take over as interim head coach of the Penrith Panthers following the resignation of Matthew Elliott.
Georgallis had won his first two games when it was announced that Phil Gould had chosen Ivan Cleary to be the Penrith coach from 2012 onwards.
[12][13] In 2014, Georgallis joined the Manly Warringah Sea Eagles as an assistant coach, spending two years at the club.
[21] On 14 July 2020, following Canterbury's Round 9 loss to the Brisbane Broncos, Georgallis was named as the club's interim head coach for the remainder of the 2020 NRL season, following Dean Pay's resignation.
[22] In Round 11, Georgallis earned his first win as Canterbury-Bankstown head coach, defeating the Newcastle Knights 18–12 in his second game in charge.
[24] Following the appointment of Trent Barrett as Canterbury head coach for the 2021 NRL season, Georgallis left the club.
[25] Georgallis coached Greece at the 2021 Rugby League World Cup where Greece we’re placed in the hardest group of the Minnows with semi finalists England and finalists Samoa in their pool, failing to win a match but playing valiantly against all especially the French who have played rugby league at the top level for over 70 years.