Coach Scott Robertson said the return of the experienced Crotty would be "huge" for the Crusaders.
"His ability to understand the game and make good calls, and defensively he's as sharp as you get, so he's a big part of our team and we welcome him back," he said.
With Dagg on the wing and Havili at fullback, Robertson said the Crusaders had a good balance in their back three.
"We've got a power wing in Seta, so we can expect a lot with an aerial attack and we can cover it with those players."
The Crusaders were on the wrong end of a heavy penalty count last week against the Hurricanes, and Robertson said they'd taken some valuable lessons on board.
"We've got to be better in a lot of areas, (be) clear and obvious at the breakdown, and just trust our system a lot more than we have."
Crusaders: David Havili, Israel Dagg, Jack Goodhue, Ryan Crotty, Seta Tamanivalu, Richie Mo'unga, Bryn Hall, Kieran Read, Matt Todd, Jordan Taufua, Sam Whitelock (captain), Scott Barrett, Owen Franks, Codie Taylor, Joe Moody.
Reserves: Ben Funnell, Wyatt Crockett, Michael Alaalatoa, Luke Romano, Pete Samu, Mitchell Drummond, Mitchell Hunt, George Bridge