Paul Rowley has left his role as head coach of St Helens with immediate effect, just under a year after taking the job. The decision comes a day before the team's derby match. The club confirmed the news without providing further details about the reasons for his departure. Rowley, a former player, joined St Helens ahead of the current Super League season. His sudden exit leaves the team without a head coach on the eve of a key rival fixture. St Helens have not yet announced who will take charge for the derby. The club is expected to make an interim appointment or promote from within. Rowley's tenure ends after less than a full season at the helm. The Super League side will now focus on the upcoming match while searching for a permanent replacement.