TUCSON, Ariz. -- On Monday morning, Rockies right-hander Jason Hirsh looked at his text messages but didn't find good news -- like a target date for him to begin his comeback from inflammation in his shoulder. "Three days ago," was Hirsh's preference. "I'm not a happy camper right now."

Happiness is not an MRI, but that's exactly what Hirsh had on Monday night, and the results weren't known Tuesday afternoon. What the procedure reveals holds the key to whether he can re-enter the competition for a starting rotation spot.

"I'm trying to get conditioning and stay on top of my workout," Hirsh said. "Honestly, if I can throw 75-80 pitches, I think that would give me a good shot at getting there."

Hirsh, who went 5-7 with a 4.81 ERA as a rookie last season before suffering a broken right fibula when hit by a line drive Aug. 7, said the rehab had his arm in better-than-expected shape before camp. But after throwing two scoreless innings against the Brewers on March 1, Hirsh suffered soreness and hasn't appeared in another game.

The newest Rockies injury doesn't appear to be serious. Right fielder Brad Hawpe made an awkward throw during Monday's 10-9 loss to the Diamondbacks and missed Tuesday with a sore left elbow. Also, righty reliever Darren Clarke is sitting out of game action because of a sore shoulder.

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Two key pitchers will return from pain Wednesday against the White Sox at Tucson Electric Park.

No. 2 starter Aaron Cook, who had his last start skipped because of a sore shoulder, will start. Righty reliever Jose Vizcaino reported no problems after a bullpen session on Monday and is scheduled to pitch during Wednesday's game.

Right-hander Jose Capellan, obtained in an offseason trade with the Tigers, will throw a batting practice session on Wednesday. It'll be his most extensive action since suffering a right ankle strain early in camp.