NEW YORK - Manager Bob Melvin said that starter Trevor Cahill’s status is still up in the air.

Cahill, who is out with a minor elbow impingement, threw an “up-and-down” bullpen session Sunday, with a simulated inning break. “We’re still trying to figure out where we’re going with that,” Melvin said. “He felt pretty good but not 100 percent at this point.”

Melvin said that the team will have a better idea how much time Cahill might miss on Monday. Initially, it was thought he might just miss the minimum 10 days on the disabled list.

“Anything is possible,” Melvin said.

Kendall Graveman, drilled on the right shin by a Didi Gregorius liner on Friday night, was able to throw his side session Sunday and also did some running, so his next start Wednesday is not in jeopardy. Graveman was called up to fill in for Cahill.

Susan Slusser is a San Francisco Chronicle staff writer. Email: sslusser@sfchronicle.com Twitter: @susanslusser