Taylor Buchholz went 1-0 with a 3.75 ERA in nine relief outings between the Jays and Rockies in 2010.
He pitched in 22 Minor League rehab games in the Rockies' farm system, going 1-1 with a 5.06 ERA. Buchholz missed the entire 2009 season following Tommy John surgery. A native of Lower Merion, Pa., Buchholz is 19-21 with a 4.39 ERA in 135 Major League appearances, 27 of which have been starts.
Boston's rotation is already six deep, so Buchholz's best chance of making the squad in Spring Training would be as a reliever. Buchholz broke in to the Majors with the Astros in 2006 and pitched for the Rockies from 2007-10, before a brief stint in Toronto at the end of last season.
With the addition of Buchholz, the Red Sox's 40-man roster is at 36 players.