The Giants recalled Villar from Triple-A Sacramento on Thursday.
With Wilmer Flores (knee) headed for the injured list, the Giants will call upon Villar to provide the team with additional infield depth. In six games with San Francisco this season, the 27-year-old has gone 5-for-17 with a home run and four RBI, and he's also posted an .857 OPS through 311 plate appearances in Triple-A. He'll presumably serve as the Giants' primary option at first base against left-handed pitching until Flores returns from the IL.