The Red Sox signed Brebbia to a minor-league contract Thursday, Tom Caron of NESN reports.
Brebbia allowed five runs over 4.1 innings in three appearances for the Rockies earlier this season but has spent most of the year at the Triple-A level, posting a 4.14 ERA and 45:11 K:BB over 37 innings. He will provide some experienced relief depth at Triple-A Worcester.