Musi joined the academy of FCSB from Spanish side Valencia in 2016. He made his professional debut for the former club by starting in a 0–1 Liga I loss to Universitatea Craiova, on 19 May 2021.[1]
In December 2022, Liga II team Politehnica Iași signed Musi on loan for the remainder of the season.[3] He made 13 appearances and scored five goals, including doubles against title contenders CSA Steaua București (5–1 win) and Dinamo București (4–1 win) in May, as "the White-Blues" won the Liga II and earned promotion to the first division.