Quentin Valentino was born in Grasse and began playing rugby at the age of five for RO Grasse.[1] In 2021, he joined Stade niçois, entering the Projet de Performance Fédéral (PPF) and establishing himself as one of the top French prospects of his generation.[2]
In 2024, Valentino moved to Pau's academy to continue his development at a higher level.[3]
Valentino made his professional debut with Section Paloise in the 2024–25 season. He participated in the Supersevens 2024 tournament, reaching the final at the stade du Hameau but losing to Monaco Rugby Sevens.[4]
On 14 December 2024, he made his professional 2024–25 EPCR Challenge Cup debut against the Lions at Ellis Park Stadium, entering in the 66th minute.[5]
Valentino was first called up to the France U18 squad in 2023. He participated in the Under-18 Six Nations Festival and later joined the team on tour to South Africa for the International Series.[6]
In 2024, he was selected again for the Under-18 Six Nations Festival, playing in preparation matches against Italy and England, as well as tournament fixtures against Ireland and Georgia.[7]
In November 2024, Valentino joined the France U20 Development squad. He captained the team in a 55–36 victory over Italy.[8]