 In the middle of the 1988-1989 season, the coach Mariano Parra was sacked because Baloncesto León was in relegation posts.Then Baloncesto León signed Gustavo Aranzana, the coach of "Cajapalencia", a team which was playing in Segunda División.Baloncesto León managed to leave relegation, and the next year, led by Xavi Fernández, was promoted to the ACB for first time in its history.