Theodore replaces him on Canada's roster
Belfour informed Team Canada executive director Wayne Gretzky, citing a back problem.
"I talked to Eddie this morning and unfortunately he won't be able to play," Gretzky told the Canadian Press. "He's got a back problem, a back injury."
Last season, Belfour posted a 34-19-6 record with a 2.13 goals-against average. He registered a .918 save percentage and recorded 10 shutouts.
"I am very excited and honored to be named to Team Canada," Theodore said. "Anytime you have the opportunity to represent your country, it is a thrill, and I'm looking forward to being a part of Team Canada at the World Cup of Hockey."
"We are disappointed that Eddie can't participate for Team Canada at the World Cup," Gretzky said. "But we are thrilled that Jose is a part of our team."
The 2001-2002 Hart and Vezina Trophy winner, Theodore posted a career-high 33 wins last season to go along with six shutouts and a .919 save percentage.