The left elbow debridement performed by Dr. Neal ElAttrache in Los Angeles on Wednesday is the same surgery Alex Wood had July 20. The Dodgers said Ryu is expected to be ready for the 2017 season, but the club said he was expected to be ready for the 2016 season after last year's surgery.
His one start this year was on July 7, when he allowed six runs in 4 2/3 innings in a 6-0 loss to San Diego.
Ryu made a successful transition from Korea in his first two seasons with the Dodgers, going a combined 28-15 with a 3.17 ERA.
Ryu, 29, is signed through 2018.
Ken Gurnick has covered the Dodgers since 1989, and for MLB.com since 2001.
This story was not subject to the approval of Major League Baseball or its clubs.