The Padres recalled Jacob from Triple-A El Paso on Friday, Kevin Acee of The San Diego Union-Tribune reports.
Jacob will return to the majors as the roster replacement for Randy Vasquez, who landed on the injured list Friday with an ankle injury. Jacob has given up two runs in two MLB innings this season, but he's put up a 3.71 ERA and 1.12 WHIP through 34 innings in the minors. He'll likely be limited to low-leverage situations with the Padres.