Carolina Panthers wide receiver Steve Smith broke his arm playing flag football at his annual football camp, ESPN's Chris Mortensen reports.

ESPN's Adam Schefter adds that Smith broke the same arm last season, but this break occurred in a different spot. Smith underwent surgery last night, and while he's expected to miss a portion of training camp, Smith's agent expects him to be ready for the Panthers' 2010 season-opener against the New York Giants on September 12.

"I'm not trying to play doctor, but I don't think he'll miss any games due to this injury," Derrick Fox said. "He did this while trying to play with and help the kids."

Smith held his third annual football camp last week, hosting 175 campers between the ages of 7 and 14. The three-day camp ended on Saturday.

Smith missing at least a portion of training camp means he'll miss valuable practice time with new Panthers quarterbacks Matt Moore and 2010 second-round pick Jimmy Clausen, who are expected to compete for the starting job. Smith's injury also means that 2010 third-round receivers Brandon LaFell and Armanti Edwards will need to speed up their development during training camp.

UPDATE: Mike Florio of ProFootballTalk.com reports that the injury actually occurred during the championship game of an adult flag football league that Smith, and other NFL players, compete in, and that Smith tried to keep the injury quiet.