Venditte was called up from Triple-A Sacramento on Saturday, Andrew Baggarly of The Athletic reports.
Venditte joined the Giants on a one-year deal this offseason but didn't pitch well enough in spring training to crack the Opening Day roster. However, the switch pitcher has a 2.57 ERA, 1.00 WHIP and 9:3 K:BB over 14 innings with Sacramento and should fill a low-leverage role in San Francisco's bullpen.