After lifting the EuroLeague trophy in 2024 and earning Final Four MVP honors in the process, Sloukas became just the second player in history to win the competition with three different teams, alongside Sarunas Jasikevicius.

On June 29, 2015, Sloukas signed a three-year contract (with the 3rd year being optional) with the Turkish Super League club Fenerbahçe İstanbul.

In the summer of 2017, Sloukas signed a new 3-year contract with Fenerbahçe (with the 3rd year being optional),[9][10] at a salary of €1.7 million euros net income per season.

On 25 April 2019, Sloukas, was the star yet again for the Turkish side as he finished the game with a double-double of 25 points, 10 assists, 5 rebounds, and 4 steals against BC Žalgiris helping his club to win the series with an aggregate 3-1 to secure a place in the Final-4 for a fifth consecutive season.

On 16 August 2020, it was announced by the Euroleague that he was a member of the top ten (team) and Fenerbahce in the decade 2010-2020, being fourth in the public vote with 84.78%.

After facing Monaco in a best-of-five series, Olympiacos qualified to the Final Four with 3-2 wins , 5 years after team's last participate.

On July 6, 2023, after a week of heavy negotiating, Sloukas informed Olympiacos that he would not be renewing his contract with the club, becoming a free agent once more.

Sloukas was mainly concerned about the tactical playing style of the team and had clashed with coach Georgios Bartzokas throughout their shared tenure.

On July 8, 2023, in a move echoing the historically controversial transfer of Vassilis Spanoulis in the summer of 2010, Sloukas agreed upon a lucrative three-year deal with Panathinaikos, signing with the arch-nemesis of Olympiacos and changing the power dynamics of Greek basketball, as well as the EuroLeague, once again.

In just his first season with Panathinaikos, Sloukas lifted the Euroleague Title also winning the Final Four MVP and the Greek Championship, having a high-standards performance.