A utility player, he often played as a left back or forward, but featured in all positions except central defence and goalkeeper.

[3] Zubiaga had been substituted with a dislocated elbow in the preceding match at Elche and had barely trained before the Real Madrid game.

[4] Playing on the left wing under manager Milorad Pavić, Zubiaga scored the second goal of the Copa del Generalísimo final on 29 June 1973, which Athletic won 2–0 against Castellón.

[3] After one season in the Segunda División with Calvo Sotelo, he concluded his career back in his native region with Arenas Getxo.

[7] In February 1985, he was replaced by Ignacio Rojas,[8] returning 13 months later for the remainder of a season that ended with relegation.