1989/1991
The Chilean coach joined Sevilla FC from Valladolid, where he had had a great season and had earned a reputation as a straight and strict coach. He coached the team in the 89/90 and 90/91 seasons. His first season was erratic, but the board of directors trusted him and renewed him for two more years. After the renewal, the team showed an improvement and had a good season, finishing sixth in the league, with Polster scoring a record 33 goals. The following season the team finished an honourable eighth, but the Chilean resigned for the remaining season of his contract due to disagreements with some of the directors.