- Bruce Levine, Chicago baseball beat reporter
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Mateo threw just seven pitches on Monday. He underwent an MRI in Chicago, but he will not learn the result until seeing a doctor on Thursday.
Monday's performance followed a five-inning stint against the Giants June 30. He had been called upon for long relief when Carlos Zambrano left after one inning with a sore back.
Coleman went back to Iowa on Tuesday.
The pitching carousel continued on Tuesday as 38-year-old Ramon Ortiz was also called up from Triple-A Iowa to make his first start of the season against the Washington Nationals. Ortiz last pitched in the majors on May 19, 2010, for the Los Angeles Dodgers.
Meanwhile, Dempster's ailment was described as lower back soreness. He missed his start Monday after being hospitalized briefly on Saturday with what was described as stomach and back pain. The earliest he would be able to pitch is Saturday, but it's possible he could land on the DL. If that happened, it could be done retroactively and he could be ready to pitch shortly after the All-Star break.
Bruce Levine covers baseball for ESPNChicago.com and ESPN 1000.
The Chicago Cubs are placing Marcos Mateo on the disabled list with right elbow soreness, the team announced Tuesday.