Ward, who battled back issues throughout this past NHL postseason, returned to practice Tuesday after being re-evaluated.
"Really, it is a day-to-day thing," Ward told reporters Monday.
While he said he badly wanted to be on the ice, Ward said he owed it to the Hurricanes to be cautious.
"I got some really good treatment [Monday]. I'll keep my fingers crossed that I feel really good and can go out there [Tuesday] and perform at 100 percent," Ward said. "I can't put a finger on it, why it happened. It just did. It's something I've felt before and it lasted about a week. It's just really bad timing with this camp."
"I talked to Stevie [Team Canada executive director Steve Yzerman] and the management," he added. "You want to be on the ice, but at the same time, you don't want to jeopardize hurting it even more because, in the long haul, it's going to be about your regular season with your NHL club that's going to dictate if you make this team or not."
The other NHL goalies invited to the four-day camp are Martin Brodeur, Marc-Andre Fleury, Steve Mason and Roberto Luongo. There are 46 players in all taking part in Calgary, a group that will be narrowed down to a 23-man roster by Dec. 31.
Canada finished seventh overall in the 2006 Olympics after ending a 50-year gold-medal drought in 2002.