St Helens have given a new five-year deal to Mark Percival, who expressed his joy at remaining with the 2019 Grand Final winners.
St Helens failed to score as Warrington claimed a big Super League scalp, thanks to tries from Daryl Clark, Tom Lineham and Josh Charnley.
St Helens prop Luke Thompson will leave Super League champions after the 2020 season to join Canterbury Bulldogs.
Defending Super League champions St Helens got off to a superb start under new coach Kristian Woolf with a 48-8 win over Salford Red Devils.
Although St Helens dominated Super League in 2019, new head coach Kristian Woolf believes the team can still get better this term.
NRL champions Sydney Roosters will be aiming to retain the World Club Challenge trophy when they visit St Helens in 2020.
Super League's reigning Man of Steel Jackson Hastings will be part of a 24-man touring party for Great Britain.
St Helens won a first Grand Final since 2014 and triumphant captain James Roby says this is the best team he has played in.
St Helens had done everything but win a major final under Justin Holbrook and the coach was delighted to break that duck at Old Trafford.
St Helens will say goodbye to head coach Justin Holbrook, who revelled in seeing his side clinch Grand Final glory against Salford.