Greek giants Olympiacos held talks with Stergiakis but the goalkeeper wanted first-team football and chose to go on trial with Slavia Sofia.

[1] On 21 August 2016, Stergiakis made his debut for Slavia coming as a substitute in the 74th minute in a 4–0 away loss against Levski Sofia.

[4] On 6 October 2020, Stergiakis joined Championship side Blackburn Rovers on a three-year deal, with the club having the option to extend the contract by a further 12 months.

[6] In November 2018, Stergiakis was called up by Greece U21 for the first time and appeared as an unused substitute in the 2019 European Under-21 Championship qualification play-offs against Austria.

[8] His final appearance for the U21 national team came in the form of a 5-0 defeat in the side's 2021 European Under-21 Championship qualifiers game against Croatia on 3 September 2020.