He is on the books of St Gallen Women and wears shirt number 8. At international level, he features for Switzerland Women U17. His main role on the pitch is Forward.

During the Switzerland Women's Division 1 2025-2026 campaign, Lia ammann made 13 appearances, scoring 3 goals and adding 0 assists. He averaged 0.2 goals per match from 0 shots, with 0 on target.