Óscar Valentín Martín Luengo (born 20 August 1994) is a Spanish professional footballer who plays as a defensive midfielder for and captains La Liga club Rayo Vallecano.
Born in Ajofrín, Toledo, Castile-La Mancha, Valentín finished his formation with CF Rayo Majadahonda, and made his senior debut during the 2012–13 campaign, in Tercera División.
In July 2014, Valentín joined Rayo Vallecano,[2] and was immediately loaned back to Alcobendas.
[5] Valentín was a regular starter during the 2017–18 campaign, contributing with 33 league appearances as his side achieved promotion to Segunda División for the first time ever.
[7] In the 2023–24 season, he became the captain of his team, in addition to scoring his first La Liga goal in a 2–2 away draw against Sevilla on 7 October 2023.