Ros was born in Montpellier. He joined Montpellier as a youngster in 2019, having previously played for nearby Castelnau Le Crès. He graduated through the club's youth system and was released at the end of the 2021–22 season.
On 27 July 2022, Ros signed his first professional contract with Pau FC.[1] Ros made his professional debut with Pau in a 0-0 Ligue 2 draw with Dijon FCO on 6 August 2022.
Marius Ros has mutually terminated his contract with Pau FC ahead of its June 2024 expiration. After making only two Ligue 2 appearances during his second season with the club, Ros, who had been a key player for the reserve team, decided to leave in search of more playing time elsewhere.[2]
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