He attended Collège Elite, a French international school in Beirut, and started playing basketball at the age of ten.

[5][6] In 2014, Mansour received a scholarship to complete his secondary education in the US at the Genesis Academy in Lynchburg, VA, and joined the school’s basketball team.

[5] In 2016, Mansour played in the FIBA Asia Under-18 Championship, where he was a top scorer for the Lebanese national team, and made it to the top-five players list of the tournament.

[5][8][10][6] Mansour began playing professionally at the age of 18 for Louaize Club and stayed with the team until 2017.

He signed with the Hoops Club where he was one of the top scorers; and stayed with the team for two years, where he scored his first triple-double against Sagesse SC in the Lebanese Basketball League championship, recording 18 points, 12 rebounds, and 13 assists.