Selanne's agent, Don Baizley, confirmed to The Orange County Register that Selanne had surgery in Finland but did not offer any other specifics about the injury. The Ducks also confirmed Selanne underwent surgery.
Ducks general manager Bob Murray did not want to speculate about the surgery but hinted that the procedure was more exploratory, according to the report.
Selanne, who turns 41 on Sunday, became an unrestricted free agent Friday.
After the Ducks were eliminated from the Stanley Cup playoffs in April, Selanne did not give any indication about his plans.
"I'll let you know when I know something," Selanne told ESPNLosAngeles.com. "I'll just wait and see how I feel. I don't have to rush."
Selanne had reconstructive knee surgery in 2004-05, when the NHL was in a lockout.
Selanne had 31 goals and 80 points in 73 games last season. In his career, he has scored 637 goals and recorded 1,340 points in 1,259 games.
Selanne's former linemate, Paul Kariya, announced his retirement Wednesday. Kariya missed all of the 2010-11 season because of post-concussion symptoms and was still unable to play because of damage to his brain.