Castleford scrum-half Luke Gale hopes to play in their semi-final against St Helens only 16 days after appendix surgery.
Castleford Tigers' dominance of Super League is reflected by six of their players being selected in the 2017 Dream Team.
Featherstone Rovers run in four tries to beat Halifax and win their first game in the Qualifiers in their final game of the season.
Widnes seal their Super League safety by beating Catalans, who must now visit Leigh in the Million Pound Game.
Audio & Video
St Helens' Ben Barba creates a bit of "magic" for Mark Percival to finish and open the scoring for Saints in their 30-4 victory away to Salford Red Devils in the Super 8s.
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