Posey fouled a ball off the top of his back foot in the second inning of Friday's 3-2 loss to the Yankees, causing the bruise and prompting him to leave the game before the bottom of the fourth inning. X-rays taken of Posey's ankle revealed no fracture.
Posey, whose playing status was listed as day to day, has started 72 of San Francisco's 97 games behind the plate. He also has started six games at first base and four as a designated hitter.
Chris Haft has covered the Giants since 2005, and for MLB.com since 2007. Follow him on Twitter at @sfgiantsbeat and listen to his podcast. This story was not subject to the approval of Major League Baseball or its clubs.