The Ducks also revealed center Nate Thompson will undergo shoulder surgery because of a hit against the boards in the Ducks' regular-season finale in Arizona.
The Getzlaf news could help explain why he slumped in the late going of Anaheim's Western Conference finals loss to the Chicago Blackhawks.
Getzlaf was a combined minus-four in the final two games.
Rest and rehabilitation will allow Getzlaf to heal, sparing him from surgery, the Ducks announced.
Getzlaf explained last week he was dealing with ordinary "bumps and bruises" of an extended season and said any other admission of injury after a playoff loss seemed like "excuse-making."
Getzlaf said that after Ducks General Manager Bob Murray referred to Getzlaf having an injury last week.
Thompson missed the Ducks' first-round sweep of Winnipeg but performed strongly early in the Chicago series.