He currently plays for Arenas Club de Getxo, wearing the number 22 shirt. He plays primarily as a Forward. His current market value is estimated at 50K €.

His most recent move was a from Ternana to Arenas Club de Getxo on 2025-07-18.

In the Primera Federación 2025-2026 season, Carlos Mattheus Caballero scored 2 goals and provided 0 assists across 26 appearances, averaging 0.1 goals per game with 0 shots attempted and 0 on target.