Warrington sign back-row forward Luis Johnson on a four-year deal from Castleford for a £45,000 fee.
Catalans Dragons sign France international Benjamin Jullien for an undisclosed fee from Warrington Wolves.
Warrington Wolves sign winger Mitch Brown from Championship side Leigh Centurions on a one-year deal.
Champions Leeds Rhinos will start the defence of their Super League title at Warrington Wolves on 1 February, 2018.
Audio & Video
Warrington Wolves head coach Tony Smith tells BBC North West Tonight that his next job may not be in rugby league.
Rugby alerts, newsletters and social media
Get latest scores and headlines sent straight to your phone, sign-up to our newsletter and learn where to find us on online.
Commentaries, clips and podcasts
Enjoy the best debate, analysis and interviews with BBC 5 live and World Service plus our rugby commentary listings.
How to get into Rugby League
How to get into rugby league - a crowd-pleasing, physically demanding game with few stoppages and plenty of pace.
What's on BBC Sport this week
This week's sport on the BBC includes the third Test of the Ashes series, Bobsleigh and Skeleton World Cup, Premier League football and Sports Personality of the Year.