On the day they reinstated star third baseman Alex Rodriguez from the disabled list, they put catcher Jose Molina on the DL because of a strained left quadriceps. He hurt himself running the bases Thursday night.
The 24-year-old Kennedy was pitching in Triple-A this season after going 0-4 with a 8.17 ERA for New York last year. The righty had felt numbness in his pitching hand last month.
Doctors diagnosed Kennedy with an aneurysm around his biceps. Dr. George Todd, who operated on pitcher David Cone's aneurysm in 1996, will do the procedure. It was uncertain when Kennedy would be able to pitch again.
Cone pitched no-hit ball for seven innings against Oakland in his return from that surgery. Manager Joe Girardi told Kennedy that story, hoping to reassure him before the pitcher sees Todd on Tuesday.
"This guy does really good work," Girardi told Kennedy.