The official site reports:

Damon spent about an hour on the trainer's table on Wednesday before the scheduled afternoon contest was washed out. The Yankees did not plan to send Damon for tests on Wednesday, though Cashman said it would be a possibility Thursday if Damon does not show improvement.

"The fact that he's still sore today would eliminate the word 'cramp,'" Cashman said. "He's probably got a little strain we're dealing with now."

Yankees manager Joe Torre did not want to look ahead to the worst-case scenario of a disabled-list stint, hoping that one more day of rest could cure what ails Damon.

The article also notes that Ron Villone has signed a minor league deal and will report to AAA.