It is reported that Celtic are monitoring Wolfsberger's Austrian goalkeeper, Nikolas Polster, who is 23 years old. Celtic are one of several clubs monitoring the player. A number of Premier League teams, including Wolves and Brentford, are also tracking Polster, and Brighton and St Etienne have also been credited with an interest. The goalkeeper's current team, Wolfsberger, is facing potential relegation from the Austrian top flight, which could result in his departure. According to a report, both Celtic and Wolves would expect the player to be within their respective playing budgets. Polster joined Wolfsberger in July 2024, and his contract is valid until June 2027. He has not yet been capped by the Austrian national team and his current Transfermarkt market value is €2.00m.