"He's not going to pitch," said Orioles manager Dave Trembley. "He's got an elbow sprain so he will not pitch."
The 27-year-old Cabrera experienced discomfort in his right elbow during a side session on Wednesday in Toronto, and was immediately sent to Baltimore to meet with team orthopedist Dr. John Wilckens.
Trembley indicated that Wilckens compared the MRI results with an earlier one that Cabrera had undergone, and found that there were no major issues.
Cabrera, who is still under contractual control by the Orioles next season, finished the 2008 campaign in a severe tailspin on the mound. In his 10 starts since the All-Star break, he went 2-5 with a 7.59 ERA. During that span, opponents were hitting .343 against him, with a gaudy .432 on-base percentage.
Cabrera's absence has also left a void in the Orioles starting rotation. Trembley has yet to name a starter for Saturday's game in New York and said that he will not do so until at least Friday.
The rotation may get a boost in the final week of the season though, as injured starter Jeremy Guthrie is progressing well in his return from a sore right shoulder, which has sidelined him since Aug. 29. Trembley said that Guthrie threw long toss on Thursday and felt "very good."
The plan now is to have the right-hander throw a side session on Saturday, with the hope that he could possibly come off the disabled list to start one of Baltimore's games in the upcoming series against the Rays next week.
David Singh is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.