"My fingers were like sausages. I couldn't feel the ball," Mullee said.
Mullee, 28, has had two Tommy John surgeries, so the Yankees will keep a close eye on any injury symptoms. Mullee said his shoulder and elbow felt normal, which he considered encouraging.
"He said his hand didn't feel right," said Girardi, who added that Mullee experienced similar symptoms this spring. "The doctor here looked at it and doesn't see anything alarming, but he just said his fingers didn't feel right. That concerned me."
Mullee was making the third appearance of his big league career, having debuted on May 16 at Arizona. This is his second stint with the big league club this season, having been recalled from Triple-A Scranton/Wilkes-Barre on Tuesday.
"I think it might be more of a circulation thing," Mullee said. "Hopefully it was just some freak weird thing going on."
Bryan Hoch has covered the Yankees for MLB.com since 2007. Follow him on Twitter @bryanhoch, on Facebook and read his MLBlog, Bombers Beat. This story was not subject to the approval of Major League Baseball or its clubs.