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As to whether this falls in the category of unacceptable off-the-field injuries, Girardi said: “I don’t want to get into that now. What I want to talk about is getting him better and being there for this kid. He’s going through a lot.”

Cashman said Chamberlain’s son was not hurt. The boy began kindergarten last year and Chamberlain often tweets about how proud he is of his son’s hockey.

Chamberlain went 2-0 with a 2.83 ERA in 27 relief appearances last season before elbow surgery June 16. Now, another setback

“I feel extremely bad for him,” Yankees captain Derek Jeter said. “He’s worked hard to get his arm back in shape. A fluke accident. I feel extremely bad for him. He’s got to be disappointed. I feel terrible for him.”

Chamberlain was his usual playful self inside the Yankees‘ clubhouse Thursday and had a bullpen session set for Friday.

“From the baseball stuff, he was doing great,” Cashman said. “I feel bad because I know how much he loves his game, and how much he was looking forward to coming back ahead of schedule. It’s clearly derailed that, but what more does that mean, I don’t know. A lot of things must be running through his mind.”

Chamberlain has had an up-and-down career since joining the team in August 2007. He started out 2-0 with an 0.38 ERA in 19 relief appearances.

Chamberlain later inspired the “Joba Rules” that governed how much he would pitch, with the Yankees wary of overusing him while deciding whether he would be a starter, setup man or closer-in-waiting behind Mariano Rivera.