He is on the books of Arenas Club de Getxo and wears shirt number 22. His main role on the pitch is Forward. His stronger foot is Right. His estimated market valuation currently stands at 100K €.

His latest transfer saw him join Arenas Club de Getxo from Ternana via on 2025-07-18.

During the Primera Federación 2025-2026 campaign, Carlos Mattheus Caballero made 26 appearances, scoring 2 goals and adding 0 assists. He averaged 0.1 goals per match from 0 shots, with 0 on target.