Sandoval compared this episode to the game against Oakland on May 30 when he initially sustained the injury.
"It's kind of the same feeling. Sore," said the switch-hitter, who on Sunday likely will undergo his second MRI since the mishap occurred.
Manager Bruce Bochy rated Sandoval's availability for Sunday's series finale as doubtful.
Sandoval's ailing foot caused him to miss last weekend's three-game series at St. Louis. He rejoined the lineup last Tuesday when the Giants faced Toronto.
Before experiencing his foot problems, Sandoval started 52 of the Giants' first 54 games.
Chris Haft is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.