"This could be a gametime decision," Bochy said about 2 1/2 hours before the scheduled first pitch.
Third baseman Pablo Sandoval also caught the flu bug, but his ailment was mild.
"I play better when I'm sick," Sandoval told the Spanish-language blog Beisbol Por Gotas. "It's not going to stop me."
Infielder Nick Noonan, who was plowed into by Colorado's Carlos Gonzalez during a pickoff attempt Sunday, said that the right side of his neck and collarbone remained sore.
In another health-related development, right-hander Santiago Casilla revealed that he's wearing two different braces to cope with a cyst in his right knee. Casilla dons a light brace whenever he's not on the mound, then switches to a bulkier one to pitch -- which he had done only once before Monday since taking an eight-day break to rest the knee. The game brace, Casilla said, "is a little bit more uncomfortable."
Chris Haft is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.