Phillips, 29, was hit by a fifth-inning pitch from Tampa Bay starter Jason Hammel, prompting him to jump up and down and lose his helmet before making the walk to first base. After a brief examination on the field by Yankees manager Joe Torre and assistant athletic trainer Steve Donohue, Phillips remained in the game.
He pumped his fists after crashing into Tampa Bay catcher Dioner Navarro while scoring on a Melky Cabrera double to right, slapping his hand in ahead of the tag. But Phillips did not return for the next inning, heading straight for the clubhouse to have ice and a wrap applied.
"The trainer came out and told me he was pretty sore," Torre said. "He probably could throw the ball, but he'd have a tough time swinging the bat. That's when we took him out."
Phillips was replaced at first base by utilityman Wilson Betemit, and the Yankees announced that Phillips was taken to Columbia Presbyterian Medical Center in New York. The club expected to have more information on Phillips' injury before its series opener Monday against the Mariners.
In 61 games for the Yankees, Phillips is batting .292 (54-for-185) with two home runs and 25 RBIs. He was 1-for-1 in New York's 8-2 loss Sunday.
A seventh-round selection of the Yankees in the 1999 Draft, Phillips began the season at Triple-A Scranton/Wilkes-Barre after missing a bid to make the club out of Spring Training, batting .301 (75-for-249) with 11 home runs and 36 RBIs against International League pitching.
Bryan Hoch is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.