The routine procedure was performed by Dr. Lewis Yocum after the regular season ended to clean up the left elbow area, the team said Tuesday in a release. Romero also received PRP (platelet-rich plasma) treatments to both knees to enhance the recovery of his quadriceps tendinitis.
The 27-year-old southpaw struggled last season. He finished with a 9-14 record and 5.77 earned-run average.
Romero left his last start of the season on Sept. 30 after only three innings due to a left leg injury.
His off-season throwing program and readiness for spring training were not expected to be affected by the procedures, the team said.