Domatas began his football career in the youth teams of his local side Ergotelis and signed his first professional contract with the club, on 24 May 2012. He scored his first goal on 24 October 2012, during a Cup match against Aiginiakos. He would proceed to add another two goals during Ergotelis' 2012–13 Football League season, thus helping his club gain promotion to the Superleague.
