[1] Sourlis started his football career from Olympiacos FC's academy and he later on became a senior team member in 2019 after signing his first contract with the club.
He made his debut appearance for the Reds in 15 July 2020, in a game against OFI for the 2019–20 Super League Play-offs, getting subbed on in the place of Maxi Lovera.
In the 2020–21 season, he made three more appearances for the club against AEL, Aris Thessaloniki and Asteras Tripolis.
[2] On 27 June 2024, after a year-long stint with Asteras Tripolis, Sourlis was transferred to Polish top-flight club Raków Częstochowa.
He signed a two-year contract, with an option for a further two years,[3] and left the club by mutual consent on 18 September 2024, without making a single appearance.