Berroa was added to Seattle's 40-man roster Tuesday.
The move means Berroa won't be available in the Rule 5 draft. While Berroa is now a step closer to his big-league debut, it's unlikely he pushes for a spot on the Opening Day roster. He's yet to reach the Triple-A level, and while he struck out 35.6 percent of opposing batters in nine starts for Double-A Arkansas, he also walked 16.8 percent, more than double the major-league average.