Midfielder and full back best known for his time playing with Athletic Bilbao. He made over 350 official appearances with the club.
He made his professional debut with Deportivo Alavés.
With Athletic Bilbao, he was a runner-up for the UEFA Europa League in 2011-2012, and a runner-up for the Copa del Rey in 2008-09, 2011-12 and 2014-15.
He was born Óscar de Marcos Arana in Laguardia, Spain.
Once Andoni Iraola departed, he became the regular right-back for Athletic Bilbao.