Suarez was optioned to Triple-A Sacramento on Friday, Kerry Crowley of The San Jose Mercury News reports.
Suarez rejoined the Giants at the end of July and posted a 4.76 ERA, 1.76 WHIP and 8:4 K:BB over 11.1 innings. The 26-year-old will return to Sacramento, where he has a 5.46 ERA and 1.60 WHIP in 15 starts.