Born in Bihać, Bosnia and Herzegovina, Musa began playing soccer at first, before choosing to focus on basketball.

Musa started playing junior basketball in the youth setup at KK Bosna XXL, when he was 8 years old.

[3] In June 2017, Musa attended the Adidas Eurocamp, a basketball camp based in Treviso for international NBA draft prospects.

[14] On January 13, 2021, Musa signed a 2.5 year contract with Anadolu Efes of the Turkish Basketball Super League.

[17] In just one season, Musa became one of Breogán's most legendary players, by helping them sealing participation in the Copa del Rey for the first time in more than 30 years.

[18] On July 14, 2022, Musa signed a two-year deal with reigning Spanish champions and EuroLeague finalists Real Madrid.

Musa played at the 2014 FIBA Europe Under-16 Championship with the Bosnian national Under-16 team, leading the tournament in scoring, at 23.0 points per game.

On 29 June, Musa managed to shoot 18-of-26 from the field and 11-of-15 from the free-throw line, adding 7 rebounds and 4 assists during 27 minutes and 15 seconds he spent on court.