"We are going to have his elbow checked out," Cashman said.
Sabathia has had a bone spur in his elbow since his days with the Cleveland Indians, a source said, and likely just needs the spur cleaned out.
Sabathia had his elbow checked in August after he experienced stiffness and was placed on the disabled list. All of his ligaments were fine then, the source said, so the expectation is this is not a serious issue.
However, Sabathia told reporters outside Yankee Stadium on Saturday that he's "a little bit" concerned.
"Yeah, you have to be concerned, because like I've said, I've never had any problems with the elbow before," Sabathia said, according to the New York Daily News. "We have to wait and see. ... It's something that I've not felt before, never had, so it's best to go get it checked out and go from there."
Sabathia, 32, went 15-6 with a 3.38 ERA for the Yankees this season. In three postseason starts, he was 2-1 with a 3.38 ERA.
Sabathia was tagged for six runs on 11 hits in just 3 2/3 innings in New York's elimination loss to the Detroit Tigers in Game 4 of the American League Championship Series. During that game, his velocity was down and he struggled with location.
Sabathia signed a seven-year, $161 million contract with the Yankees prior to the 2009 season.
Mike Mazzeo is a regular contributor to ESPNNewYork.com.