Kaja Erzen is a professional footballer from SLO and is currently 32 years old. He is on the books of Ternana W and wears shirt number 22. At international level, he features for Slovenia Women. His main role on the pitch is Defender. His stronger foot is Right.

Across the Italian Serie A Women 2025-2026, Kaja Erzen appeared in 15 matches and averaged 0.3 tackles, 0.1 interceptions, 0.5 clearances, and 0 blocked shots per game.