had arthroscopic surgery on his injured right shoulder last month, two sources told ESPN.
The sources said the quarterback had the surgery because he wants to play for the Minnesota Vikings this season, which would be his 19th in the NFL.
Favre suffered a torn biceps tendon while playing for the New York Jets last season.
According to the report, Favre had the surgery after cortisone injections and exercise failed to be effective treatments.
Favre has thrown on a limited basis since the surgery, but has not felt close to "100 percent" and would not come back unless he makes significant progress, sources told ESPN.
* Landon Donovan and Carlos Bocanegra scored as the United States defeated Honduras, 2-1, Saturday night in Chicago in a World Cup qualifier. Seeking its sixth straight World Cup berth, the United States (3-1-1) is second in the final round of North and Central American qualifying with 10 points, two behind Costa Rica (4-1).
* Brawn GP's Jenson Button won the Turkish Grand Prix in Istanbul for his sixth victory in seven Formula One races.
* Kenya's Rose Kosgei won the 38th New York Mini 10K in Central Park, finishing in 32 minutes, 43 seconds to beat Serena Burla, of Ellisville, Mo., by 21 seconds in the women's-only race, which had 6,100 runners for its biggest field since 1999.