He currently plays for Celta Vigo B, wearing the number 19 shirt. At the international level, he represents Spain U18. He plays primarily as a Midfield. His current market value is estimated at 500K €.

His most recent move was a from Celta de Vigo U19 to Celta Vigo B on 2024-07-01.

Across 23 appearances in the Primera Federación 2025-2026, oscar marcos registered 5 goals and 1 assists, while completing 0 key passes out of 0 total passes with a passing accuracy of -.