Castleford's Joe Wardle joins Tigers' Super League rivals Huddersfield Giants, as Jordan Rankin moves in the other direction.
England half-back Luke Gale is to miss a "big chunk" of 2019 for Castleford after he ruptures an Achilles tendon.
Castleford and England half-back Luke Gale faces a lengthy period out after suffering a suspected ruptured Achilles tendon.
Golden-point extra-time and shot clocks to speed up play are among the law changes confirmed for Super League in 2019.
Audio & Video
Sam Tomkins scores a try in his last home appearance for Wigan as they beat Castleford Tigers 14-0 to reach the Super League Grand Final.
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