The procedure was performed by Dr. Marc Philippon in Vail, Colorado.
Toskala last played on March 3.
The Finn was 22-11-17 in 53 appearances this season with a 3.26 goals-against average and .891 save percentage.
Toronto also announced Monday that defenseman Mike Van Ryn will miss the rest of the season because of a torn knee ligament. Van Ryn injured the medial collateral ligament tear in his left knee during the first period against Edmonton on Saturday. He won't need surgery and should be healed in 10 weeks.
Van Ryn played only 27 games this season because of various injuries, including two concussions.
Fellow defenseman Jonas Frogren, also injured in the first period against Edmonton, sprained a medial collateral knee ligament and will not play again this season.