Guillorme (oblique) was activated from the 10-day injured list Friday, Justin Toscano of The Bergen Record reports.
The 26-year-old has been sidelined by a strained right oblique since late April, but he'll rejoin the active roster Friday following a six-game rehab stint at Triple-A Syracuse. Guillorme could see significant playing time early on between second and third base with Jeff McNeil (hamstring) and J.D. Davis (hand) still on the injured list.