CHICAGO -- Cubs right-hander Yu Darvish is back on the disabled list for the second time this season, this time because of right triceps tendinitis, and he will undergo an MRI to determine the extent of the injury.
Darvish (1-3, 4.95 ERA) was scheduled to start on Sunday night for the Cubs' series finale against the Giants. The DL move is retroactive to Wednesday.
"We're not overly concerned," Cubs manager Joe Maddon said after Saturday's 5-4 loss to the Giants at Wrigley Field. "We're just going precautionary method right now to make sure everything is good based on the fact the guy has had a history. When I talked to him in my office, it didn't sound awful, but it sounded like something was there. As opposed to throwing him out there and be proven wrong, listen to your athlete. We thought it as the best way to do it."
In 2015, Darvish underwent Tommy John surgery and missed the entire season. Maddon said Darvish has been bothered by soreness in his triceps all week and tried to work through it. He will be eligible to pitch next Saturday in New York.
"He's been bothered a little bit recently," Maddon said. "We thought we could work through it, but there's some inflammation. We're calling it tricep tendinitis, so we want to back off to make sure it's all well."
The 31-year-old right-hander, who signed a six-year, $126 million contract with the Cubs in February, went on the DL on May 7 (retroactive to May 4) because of flu-like symptoms and returned to go four innings against the Braves on May 15, then started five days later against the Reds, giving up one run on two hits over six innings to pick up his first win with the Cubs.
In eight starts this season, Darvish has been unable to pitch past the fifth inning in five outings. He has a 25.20 ERA in the fifth this season, allowing 14 runs.
The Cubs recalled lefty Randy Rosario from Triple-A Iowa as the corresponding roster move. Rosario, 24, made 12 relief appearances this season for Iowa, posting a 0.47 ERA.
Tyler Chatwood (3-4, 3.74 ERA), scheduled to start on Monday, will now go on Sunday night in Darvish's place. The Cubs have yet to name a starter for Monday's series opener against the Pirates, but they may use lefty Mike Montgomery.