Luiz was back in action for the Blues in defeat to Liverpool.
"It will be Terry and Gary Cahill - it's tried and trusted," Carragher told Sky Sports. "Chelsea are a type of club where the club actually sign players - the manager gets changed so often it's almost like a European model.
"He's not a Conte centre-back. He's had out and out defenders at Italy and Juventus - their main job is to defend and Luiz isn't that type of player."