He is on the books of SD Amorebieta and wears shirt number 10. His main role on the pitch is Forward. He measures 180cm in height and weighs 65kg. His estimated market valuation currently stands at 100K €.

His latest transfer saw him join SD Amorebieta from SD Gernika via on 2025-07-01.

During the Spanish Segunda División RFEF 2025-2026 campaign, Mikel Arzalluz made 22 appearances, scoring 0 goals and adding 0 assists. He averaged 0 goals per match from 6 shots, with 4 on target.