Luke Whitelock joins older brothers George, Sam and Adam, who were in last year's side.
Due to salary cap restrictions the Crusaders have named only 30 players rather than 32.
Ben Funnell, Tom Taylor and Patrick Osborne have been rewarded with contracts after shining in the ITM Cup for Canterbury.
Crusaders squad: Nick Barrett, Tyler Bleyendaal, Dan Carter, Wyatt Crockett, Ryan Crotty, Israel Dagg, Tom Donnelly, Andrew Ellis, Corey Flynn, Ben Franks, Owen Franks, Robbie Fruean, Ben Funnell, Zac Guildford, Willi Heinz, Ross Kennedy, Quentin MacDonald, Sean Maitland, Tom Marshall, Richie McCaw, Patrick Osborne, Kieran Read, Luke Romano, Tom Taylor, Matt Todd, Joe Wheeler, Adam Whitelock, George Whitelock, Luke Whitelock, Sam Whitelock.