Castleford Tigers will claim they should receive £500,000 in compensation after winger Denny Solomona walked out on the club to join Sale Sharks.
Castleford Rugby League
Sale signed Denny Solomona after he was "fired" by Castleford, says Sharks boss Steve Diamond as he again defends the move.
BBC Sport looks at how the legal battle for Denny Solomona could be a landmark moment for rugby players.
Castleford Tigers launch legal action against Sale Sharks, Denny Solomona and his agent after the player's move to rugby union.
Audio & Video
Sale's Steve Diamond says Castleford rejected a "substantial offer" for Denny Solomona when they first tried to sign him.
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 Australian Open tennis, Masters snooker, European rugby union and Ski Sunday.