Polster, who had his youth training at Rapid Wien, played for Wolfsberger AC since the 2024/25 season. He was the undisputed number one goalkeeper at Wolfsberger, keeping a clean sheet eight times in 29 league matches last season. Wolfsberger finished second in the relegation group, securing their spot in the Austrian Bundesliga for another year.
Polster's departure from Wolfsberger was confirmed after he played in their 1-1 draw against Red Bull Salzburg on Sunday. He has signed a four-year contract with NEC, which will keep him at the club until 2030. NEC's technical director, Carlos Aalbers, stated that Polster's arrival completes the club's goalkeeper squad, which also includes Gonzalo Crettaz, Freek Entius, and Joep Geneste.
Aalbers revealed that NEC had been following Polster for some time, as their playing style requires specific qualities that Polster possesses. NEC has already strengthened their squad this summer with the signings of Dusan Tadic and Emre Mor, and they are eager to add more defenders to their team. With Perr Schuurs still unavailable and Philippe Sandler injured, NEC is planning to sign FC Porto defender Gabriel Brás, as previously reported by Voetbal International.
NEC is looking to strengthen their defense, and Polster's arrival is a significant step in that direction. With his experience and skills, he is expected to make a positive impact on the team.