He was elected president of the Hellenic Olympic Committee in 2009, and re-elected in 2013 to a second 4-year term.[3] He is a Member of the Executive Committee of the European Olympic Committees and he is also the Chair of the Coordination Commission of the second edition of the European Games, to be organised by the European Olympic Committees in Minsk in 2019. In the same year he became a member of the International Olympic Committee (IOC).[4]
On 10 June 2021, he was elected President of the European Olympic Committees by a 34–16 vote.[5]
On 16 January 2023, Capralos attended the funeral of Constantine II of Greece, a former Olympic champion, in his capacity as president of the Hellenic Olympic Committee.[6]
Aside from sports, Capralos is also the Chairman of Euroclinic, a private hospital in Athens, and the President and CEO of Star Bulk Carriers Corp., a Nasdaq-listed shipping company.[1] Previously, he was also Chairman of the Athens Exchange S.A.[7]