Revere hit a foul ball off his foot in the 11th inning, and fell to the ground in pain. The left-handed hitter stayed in the game, but grounded into a game-ending double play later in the at-bat.
The outfielder underwent X-rays after the game, which revealed the break. A specialist will evaluate Revere on Monday.
Philadelphia acquired the speedy outfielder from the Minnesota Twins during the offseason for starting pitchers Vance Worley and Trevor May. Revere struggled to start the season, as he hit .200 during the first month of the year, but has since raised his average to .305. Revere has swiped 22 bases this season, the fourth-most stolen bases in the NL.