Flores left Wednesday's game against the Brewers with left hamstring tightness, Kerry Crowley of The San Jose Mercury News reports.
Flores went 1-for-3 at the plate before exiting. The Giants are expected to face lefties in each of their next three games, which are matchups in which the utility infielder would typically start. The team could wind up with one more lefty in the lineup than normal for those contests if Flores isn't ready to go.