Jorge De La Rosa's comeback from Tommy John surgery hit a snag on Saturday when the Rockies decided to shut him down because of tightness in his left forearm. The left-hander had been on pace to return to Colorado's rotation on June 2, which is a day shy of the one-year anniversary of his operation. He will be able to pitch again on May 26, when a new 30-day clock starts ticking on his minor league rehab assignment, although he could return to the Rockies at any point during that time frame. "I still don't think that this is any big thing," manager Jim Tracy said. "It's just another avenue in the road that you have to go down as you're recuperating from this process and this surgery." De La Rosa said he was disappointed, but understands the Rockies are just being cautious. "I want to be here, but like they say, I need more time," De La Rosa said. "I think I have to pitch more and build up my pitches to be ready to pitch here. They want to be careful with me because it hasn't been a year since I had the surgery. So, they know how hard it is to come back from this."