He currently plays for Racing Santander, wearing the number 3 shirt. He plays primarily as a Defender. His current market value is estimated at 900K €.

His most recent move was a from Rayo Cantabria to Racing Santander on 2024-01-01.

Throughout the Spanish Segunda Division 2025-2026, Mario García Alvear featured in 28 matches, averaging 0.4 tackles, 0.4 interceptions, and 0.7 clearances per game, while blocking 0.1 shots per game.