De La Rosa (elbow) will not need to undergo Tommy John surgery according to Dr. James Andrews, Jack Magruder of the Diamondbacks' official site reports.
De La Rosa was placed on the 15-day DL on May 27 after suffering from right elbow inflammation. The MRI revealed that his ligament was stretched in the pitching arm, and he will likely need three to four months to recover. De La Rosa and the Diamondbacks are targeting a return sometime in August or early in September.