During his time with the team, Musso made nine appearances, serving as a backup to the senior goalkeeper Jan Oblak. His performances impressed Atletico's management, leading them to pursue a permanent contract.

Musso has agreed to a three-year contract with Atletico and will join the team in Madrid for a fee of €3 million. This move comes just 24 hours after Atletico signed another player, Clement Lenglet, from Barcelona.

Lenglet, a France defender, has committed to Atletico until 2028, signing a new deal with the club.