Castleford Tigers re-sign half-back Jamie Ellis from Huddersfield Giants on a three-year deal.
Super League side Huddersfield Giants sign Bradford Bulls forward Colton Roche on a two-year deal.
Huddersfield Giants sign 26-year-old prop Adam Walne on a three-year deal from Salford.
Castleford Tigers' dominance of Super League is reflected by six of their players being selected in the 2017 Dream Team.
Audio & Video
Watch the first of Jake Mamo's three first-half tries for Huddersfield as the Giants eventually lose 26-21 at home to Castleford Tigers.
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 commentary of the European Rugby Champions Cup, Champions League football and the United States Grand Prix.