Warrington have signed teenage back-rower Luis Johnson from Super League rivals Castleford on a four-year deal.
Castleford have offset the departure of promising back-rower Luis Johnson by securing the future of teenage half-back Jake Trueman.
Castleford have re-signed winger James Clare on a one-year deal.
Castleford have expressed their disappointment after they were denied the opportunity to welcome an NRL side in a World Club Series fixture.
Castleford prop Will Maher has joined Championship club Halifax on a season-long loan.
Castleford have signed Leigh prop James Green on a one-year deal as they continue to shape their squad for next season.
The World Cup Series is set to take place in Melbourne next February after unofficial talks between Super League and NRL clubs.
Warrington will host reigning champions Leeds in the first Sky Live match of the Super League season.
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