The Red Sox optioned Samaniego to Triple-A Worcester on Monday, Chris Cotillo of MassLive.com reports.
Samaniego spun 5.1 scoreless innings in Grapefruit League play, collecting a 6:2 K:BB with just one hit allowed. It wasn't enough to capture a spot on the Opening Day roster, but Samaniego is poised to make his major-league debut at some point this season.