Guillermo Balzi is a 25-year-old professional football player from ARG. He currently plays for Holstein Kiel, wearing the number 8 shirt. He plays primarily as a Midfield. He stands at 175cm tall and weighs 71kg. His preferred foot is Left. His current market value is estimated at 1000K .

His most recent move was a Free from Club Atlético Newell's Old Boys to Holstein Kiel on 2026-07-13. The reported fee was 0.55M €.

Across 7 appearances in the Greek Cup 2025-2026, Guillermo Balzi registered 3 goals and 0 assists, while completing 2 key passes out of 42 total passes with a passing accuracy of 4.6.