After a successful career at APOEL, Christos Kontis was forced to retire due to heart failure problems.
During the first official 2011–12 Cypriot First Division match (29 August 2011) between AEK Larnaca and APOEL, Kontis felt a slight discomfort and a pain in his chest.
Later that night the discomfort continued to exist and the pain got worse, thus the club's doctors moved him to Nicosia's General Hospital.
[2] Christos Kontis has served as an assistant manager of the head coach of Al-Nasr, Ivan Jovanović from 2013 to 2016.
[3] He was subsequently hired by Olympiacos for the same role, and served as the team's caretaker manager for a fixture against Larisa on 7 January 2018, while the transition from Takis Lemonis to the club's new manager Óscar García took place;[4] he also coached the team in a Greek Cup quarter-final return leg game against rivals AEK on 7 February 2018 as García was hospitalised with an appendicitis inflammation.