The Red Sox recalled Gamboa from Triple-A Worcester on Saturday, Ari Alexander of 7 News Boston reports.
Gamboa struck out two batters during a scoreless inning in his MLB debut May 5, and he has since posted a 1.89 ERA and 0.84 WHIP in 19 frames at Triple-A. He'll replace Jovani Moran (elbow) on the active roster and give the Red Sox another fresh arm in the bullpen for Saturday's game against the Yankees. He could stay in the majors for a longer look if he continues to pitch well.