Matías Galarza Fonda is a Paraguayan professional footballer who plays as a midfielder for Argentine club River Plate and the Paraguay national team. He is primarily deployed in central midfield roles, where he contributes with his energy, ball control, and tactical discipline.

Galarza Fonda is known for his ability to cover ground, retain possession, and support both defensive and attacking phases of play. Comfortable operating as a central or box-to-box midfielder, he combines physical intensity with technical quality, allowing him to press opponents effectively while also helping to progress the ball through midfield. His composure and awareness make him a reliable presence in structured, high-tempo systems at both club and international level.