NEW YORK -- Livid over Alex Rodriguez's decision to tweet an update on his rehab process, Yankees general manager Brian Cashman had a message for the third baseman.

"You know what, when the Yankees want to announce something, [we will]," Cashman told ESPN New York. "Alex should just shut the f--- up. That's it. I'm going to call Alex now."

Rodriguez tweeted Tuesday that he has been cleared to play in rehab games. Rodriguez's comments seemed to contradict what Cashman told ESPN New York's Wallace Matthews on Monday.

"Visit from Dr. [Bryan] Kelly over the weekend, who gave me the best news - the green light to play games again!" Rodriguez tweeted.

Rodriguez, in a statement released Wednesday morning though a spokesman, said "the tweet was pure excitement" over the doctor's prognosis.

"I will continue to work hard until my efforts get me back in pinstripes and help my team win," Rodriguez said.