"We're going to have him throw again," Girardi said. "Our concern is that he's just not quite ready yet. I think he's going to play catch again [Thursday], and then I'm not sure what the next step will be, whether it will be another bullpen or he will go on another rehab assignment."
Chamberlain has no record and a 3.86 ERA in 10 relief appearances for New York this season.
Bryan Hoch is a reporter for MLB.com. Follow him on Twitter @bryanhoch and read his MLBlog, Bombers Beat. This story was not subject to the approval of Major League Baseball or its clubs.