Following the game, X-rays revealed no fracture and just the dislocation. The first baseman is day to day.
"It's not broke," Napoli said. "I can play with some soreness. We'll see how it feels tomorrow."
The Red Sox will at least get Pedroia back on Wednesday. In fact, he came on as a pinch-runner for Napoli and remained in the game at second base for the bottom of the ninth.
Napoli was worried at first.
"I saw my finger sideways," said Napoli. "The first thing I thought was -- I don't really know what to think. But I've seen people with dislocated fingers before. They pop it back in. It will be sore."
Already, the Red Sox have Shane Victorino and Will Middlebrooks on the disabled list.
Ian Browne is a reporter for MLB.com. Read his blog, Brownie Points, and follow him on Twitter @IanMBrowne. This story was not subject to the approval of Major League Baseball or its clubs.