DENVER -- Rockies Opening Day starter Jeremy Guthrie was placed on the disabled list after a bike accident on his way to Coors Field on Friday. Guthrie was set to pitch in Saturday's game against the Mets, but will be on the DL, retroactive to Monday.

"He has an AC sprain of his right shoulder," manager Jim Tracy said after Friday's 18-9 win. "He's already had an MRI. There's absolutely nothing structurally wrong. He will be unable to pitch tomorrow, and we're going to put him on the disabled list. He'll miss a couple starts. In the meantime, Guillermo Moscoso will come up here and start the game tomorrow."

Guthrie is 2-1 with a 5.92 ERA in four starts with the Rockies this season. He said he is confident he'll be healthy and ready to pitch in less than 15 days. With the backdated DL placement, he is eligible to pitch again on May 8, when the Rockies will be in San Diego.

"Most of the contact was on my elbow, so I think it kind of jammed my shoulder in," Guthrie said. "We were fortunate with the results that came back. Essentially, from what I'm gathering from what [the doctor] and trainers have said, at this point, it's pretty much pain. That's what I have. There's no issue other than I just have some pain. When that goes away and I can throw, then everything's a go."

Guthrie is an avid cyclist -- he said he always wears a helmet -- and he was known to ride his bike to the park every day at Spring Training. He was biking on a trail near the Platte River and Confluence Park on his way to the ballpark Friday when his bike malfunctioned.

"It's a Cannondale Hooligan, and it has an internal hub," he said of the mishap. "The back part of the hub came across, so if anyone from Cannondale is listening, if we can get that faulty part fixed, it was kind of a malfunction. You're riding aggressively at one point, and the next thing you know, you're on the ground. Kind of a freak accident, for sure.

"This happened so fast. It wasn't like a wheel slipped out or there were conditions that made me think an accident was going to happen. There was no ability to react. I was just riding, and next thing you know, I'm on the ground."

Guthrie is in his first year with the Rockies after pitching parts of eight seasons for the Indians and Orioles. He pitched 175 innings or more in each of five seasons with the Orioles, and reached 200 innings each of the past three seasons.

Moscoso is 1-3 with a 7.91 ERA in four starts for Triple-A Colorado Springs. He's allowed 18 runs (17 earned) on 35 hits and four walks in 19 1/3 innings, with 19 strikeouts. Moscoso came to the Rockies from the A's, along with Josh Outman, in a trade for Seth Smith, and is 8-10 with a 3.47 ERA in 34 games (21 starts) with the Rangers and A's.