In this image taken from video, New York Yankees manager Joe Girardi, center right, helps Mariano Rivera, center, into a cart after Rivera twisted his right knee shagging fly balls during batting practice before a baseball game with the Kansas City Royals, Thursday, May 3, 2012, in Kansas City, Mo. The Yankees closer was sent for further tests. (AP Photo/YES Network) MANDATORY CREDIT

Associated Press
In this image taken from video, New York Yankees manager Joe Girardi, center right, helps Mariano Rivera, center, into a cart after Rivera twisted his right knee shagging fly balls during batting practice before a baseball game with the Kansas City Royals, Thursday, May 3, 2012, in Kansas City, Mo. The Yankees closer was sent for further tests. (AP Photo/YES Network) MANDATORY CREDIT
In this image taken from video, New York Yankees manager Joe Girardi, center right, helps Mariano Rivera, center, into a cart after Rivera twisted his right knee shagging fly balls during batting practice before a baseball game with the Kansas City Royals, Thursday, May 3, 2012, in Kansas City, Mo. The Yankees closer was sent for further tests. (AP Photo/YES Network) MANDATORY CREDIT
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