Despite enjoying a career season, going 16-6 with a 3.49 ERA, De La Rosa's thumb has been a constant issue. He first sustained a bruised left thumb June 17 at Toronto, but he managed to pitch through it that day and held the Blue Jays scoreless on one hit through seven innings.
In every start since, De La Rosa has admitted, the injury has been a problem to some degree. The 32-year-old recently underwent an MRI that revealed a sprain.
"I just know it hurts," Weiss said. "He's gone out there for the majority of his starts with an injured hand. That says a lot about his toughness."
Tyler Emerick is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.