Wakefield have given star forward David Fifita extended leave for personal reasons.
Castleford have expressed their disappointment after they were denied the opportunity to welcome an NRL side in a World Club Series fixture.
Wests Tigers half-back Jack Littlejohn has signed a two-year deal with the Salford Red Devils.
Leeds have a 10 per cent chance of winning the 2018 World Club Challenge, says Rhinos chief executive Gary Hetherington.
Hull Kingston Rovers have signed teenage French scrum-half Thibault Franck from Catalans Dragons on a one-year deal.
Luke Burgess has rejoined Salford Red Devils after an injury-hit spell at Catalans Dragons.
Wakefield second-rower Matty Ashurst has signed a new four-year deal with the Super League side.
Keegan Hirst will remain with Wakefield for the 2018 Super League season after triggering the option for another year.
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