Ross limped while running to first on July 22 on the turf at the Rogers Centre in Toronto, but he remained in the game. After that contest, Ross said he would try to play through what he thought was plantar fasciitis.
"We'll evaluate him tomorrow. Looks like he's got some pain in that plantar fascia tendon," manager John Farrell said. "We'll take a look at him tomorrow to make any determination at that point."
Farrell didn't speculate about Ross missing time, but Triple-A Pawtucket catcher Dan Butler exited the PawSox's game prior to the ninth inning -- not too long after Ross exited. The 27-year-old Butler, signed as an undrafted free agent in 2009, would likely be first in line to replace Ross.
Ross, 37, is batting just .192 this season, but he has been valuable as a game manager behind the plate. Boston designated A.J. Pierzynski for assignment in early July and called up Vazquez in a corresponding move.
Vazquez has played in 13 games, rotating with Ross since his call to the Majors. The 23-year-old is hitting .250 with a .645 OPS this season.
Ross said last week that he dealt with plantar fasciitis in 2007. According to the Mayo Clinic, plantar fasciitis "involves pain and inflammation of a thick band of tissue, called the plantar fascia, that runs across the bottom of your foot and connects your heel bone to your toes."
Ian Browne is a reporter for MLB.com. Read his blog, Brownie Points, and follow him on Twitter @IanMBrowne. Steven Petrella is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.