He amassed La Liga totals of 74 matches and five goals over four seasons, almost exclusively with Villarreal.

After three seasons playing with modest sides in the Catalonia area, he represented CP Mérida in 1999–2000's second division, where he produced a fine individual campaign; however, although the Extremadura team finished sixth, the club was relegated for lack of payment to its players.

His first match in the competition took place on 28 October 2000, when he came from the bench in a 0–0 home draw against Athletic Bilbao.

[3] On 28 February 2001, Unai made his sole appearance for Spain, playing 90 minutes in a 0–3 friendly loss against England in Birmingham.

[4] Previously, he represented the nation at the 2000 Summer Olympics, playing three times for the eventual silver medalists.