Dodgers pitcher Hyun-Jin Ryu allowed six runs in 4 2/3 innings in his only start this season on July 7. He was placed on the disabled list Tuesday. (Keith Birmingham/Staff photographer)

The Dodgers placed Hyun-Jin Ryu on the 15-day disabled list Tuesday with left elbow tendinitis, and suddenly need a pitcher to start Wednesday against the Washington Nationals.

The Dodgers also placed reliever Casey Fien on the 15-day DL with tendinitis in his right elbow retroactive to Sunday. Outfielder Joc Pederson, whose rehab assignment at Triple-A Oklahoma City is over, was activated from the disabled list, and left-handed reliever Luis Avilan was recalled from Triple-A.

Ryu missed all of 2015, and the first three months of the 2016 regular season, while rehabbing from left shoulder labrum surgery. He returned July 7 against the San Diego Padres and allowed six runs in 4 ⅔ innings, suffering the loss. That remains his only major league start to this point in the season.

An MRI on Ryu’s left elbow showed no changes from his previous MRI.

Jose De Leon is scheduled to pitch for Oklahoma City on Wednesday. The Triple-A Dodgers are currently in Tacoma, Washington. De Leon, a 23-year-old right-hander, has yet to make his major league debut.

Brock Stewart, a 24-year-old right-hander, has made one spot start for the Dodgers already this season and was scheduled to start for Oklahoma City tonight. It’s possible the Dodgers could give Stewart an extra day’s rest before his second cup of coffee in the big leagues.