Girardi said that he was not sure how Ellsbury initially hurt the hand; Ellsbury was not available to speak to reporters before the Yankees' scheduled game against the Mariners on Tuesday.
"It's just been bothering him for a few days," Girardi said. "He's been playing through it. We sent him to take a test and the test came back good, which is good news."
Ellsbury would be available to play defense or pinch-run on Tuesday, Girardi said. Ellsbury was just 1-for-10 in the three-game series against the Angels over the weekend, dipping his season average to .311.
Brett Gardner replaced Ellsbury in center field, batting leadoff, with Ichiro Suzuki slotted to play left field.
Bryan Hoch is a reporter for MLB.com. Follow him on Twitter @bryanhoch and read his MLBlog, Bombers Beat. This story was not subject to the approval of Major League Baseball or its clubs.