DENVER -- Manager Walt Weiss said the Rockies have not decided who will start Wednesday in place of Jhoulys Chacin, who was placed on the 15-day disabled list with a back strain and is scheduled to undergo an MRI on Monday.
Right-handed reliever Rob Scahill, 26, was recalled Sunday from Triple-A Colorado Springs, where in five games, he was 2-0 with a 4.26 ERA. He was in uniform Sunday for the Rockies. Scahill pitched in six September games for the Rox last year with no record and a 1.04 ERA.
Chacin is eligible to come off the disabled list on May 5, meaning he will miss at least two starts. After that, barring any postponements, his next turn would come up May 5 against the Rays at Coors Field. Chacin said he felt better Sunday than he did a day earlier.
The possibility of bad weather and a postponement could allow the Rockies to push their starters back a day and avoid the need of replacing Chacin on Wednesday against the Braves. Otherwise, the Rockies will have to bring a pitcher up from Colorado Springs to start.
"There's a few options down there that we could go to," Weiss said. "We're not sure who we're going to use in that spot yet. I imagine we'll have a pretty good idea in the next 24 hours or so."
Left-hander Drew Pomeranz pitched on Thursday and Tyler Chatwood started on Wednesday. Pomeranz worked 5 2/3 scoreless innings with one walk and nine strikeouts in his last game at Reno. In three starts, he's 2-0 with a 3.31 ERA and five walks and 21 strikeouts in 16 1/3 innings.
Chatwood, who has been the most consistent Colorado Springs starter, is 1-0 with a 1.84 ERA in three starts with four walks and 17 strikeouts in 14 2/3 innings. He worked four scoreless innings with two walks and six strikeouts in his last start at Reno.
Jack Etkin is a contributor to MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.