Pomeranz is fine and is not expected to miss any time.
"He felt a little something in his forearm, and I erred on the side of caution," manager Jim Tracy said Saturday. "He feels fine today. I have every reason to believe that he'll be the starting pitcher on Wednesday against the Dodgers."
The 23-year-old rookie southpaw who came to the Rockies in the Ubaldo Jimenez trade said his best guess is the stiff forearm could be a result of hitting more than he's used to, having not hit in college or the Minors.
"It just scared me, because I didn't know what it was," Pomeranz said Saturday. "It could have just been a cramp, or it could have been anything. I just don't like to feel [new] things."
Guthrie also has no serious damage but is dealing with enough pain to place him on the disabled list with the expectation of missing two starts. He already played catch Saturday, an encouraging sign. He is eligible to return May 7 when the Rockies open a series in San Diego, and Tracy is shooting for having Guthrie start that day.
Even more promising is Jorge De La Rosa's progress as he rehabs his way back from season-ending surgery to repair a ligament tear on his left elbow, keeping him out of commission since last May 25. De La Rosa pitched against the A's at extended spring workouts in Arizona on Friday and could be ready for a Minor League rehab assignment that could bring him back to the club in June.
"De La Rosa did terrific yesterday," Tracy said. "Six innings, 72 pitches, he gave up three hits, he walked one, he struck out nine, and he gave up an earned run. He sat pretty much the entire time at 91-92 mph. We're extremely encouraged. He feels really good today, which is also really encouraging the day after in relation to what it is that we've been dealing with."