Muniain is working on Salamanca UDS's Segunda RFEF project with Lezama in mind, and the recent signing of Luis Bilbao has brought the pair back together. The Berango left winger shared dressing rooms and training sessions with Muniain at Athletic, where he was called up for first-team matches and stood out with the B team. Before Ernesto Valverde's spell, he was named in three matchday squads under Marcelino, two in the league and one in the cup. He later featured in five friendlies for the first team with Valverde as head coach, but the left-footed winger has yet to make an official appearance. His pathway included loans at Cultural Leonesa and Barakaldo in Primera RFEF, plus a stint with Ceuta's reserves. He now arrives at the Helmántico to become a pillar of the team in Segunda RFEF alongside a familiar face.