 In 1999–2000, Tiko signed with neighbours Athletic Bilbao, making his La Liga debut on 12 October 1999 in a 4–3 away victory over Málaga CF.He made 20 appearances all competitions comprised during the campaign, netting once.From 2001 to 2006, Tiko was an undisputed starter in midfield for the Basques, often scoring from free kicks and dictating his team's play.