During the very successful 2020–21 season, where the club reached the Greek Basket League finals for the first time, Mouratos averaged 11.5 points, 2.5 rebounds, 5 assists, and 1.1 steals, in 33 games.

In 24 league games as the team's captain, he averaged 11.3 points, 3 rebounds, 6.3 assists and 1 steal, playing around 27 minutes per contest.

On July 1, 2022, Mouratos signed with Promitheas Patras of the Greek Basket League and the EuroCup.

In 27 domestic league matches, he averaged 6.2 points, 3.2 rebounds and 2.3 assists in 19 minutes per contest.

He also played at the 2013 FIBA Europe Under-16 Championship, where he helped Greece win a bronze medal.