Berrios was optioned to Triple-A Rochester, the Minneapolis Star Tribune reports.
Berrios may have been the leading candidate for the fifth starter role at the start of spring training, but he wasn't seen as getting enough work to be ready for the start of the regular season. He threw just 10.2 innings this spring between pitching for Puerto Rico in the World Baseball Classic and MLB spring training. He may not be in Triple-A too long however, as it's possible he could be recalled after just a few starts.