The announcements were made by Executive Vice President/General Manager Ben Cherington.
Carpenter, 26, made his Major League debut with Chicago in 2011 and posted a 2.79 ERA (3 ER/9.2 IP) over his 10 games with the Cubs, all out of the bullpen. He limited left-handed batters to a .143 average (2-for-14) and held opponents scoreless in eight of 10 outings. The right-hander also combined for 32 relief appearances between Chicago’s Double-A Tennessee and Triple-A Iowa clubs last year, going 3-4 with two saves and a 5.91 ERA (28 ER/42.2 IP) between the two stops.
Selected by the Cubs in the third round of the 2008 First-Year Player Draft, Carpenter owns a 21-19 record, two saves, a 3.62 ERA (137 ER/341.0 IP) and 289 strikeouts in 96 career minor league games (60 starts) in Chicago’s system. He started 60 of his first 64 professional outings and has appeared in relief in each of his last 42. Carpenter led all Cubs minor leaguers with a 2.82 ERA (41 ER/130.2 IP) in 2009 and was named an Arizona Fall League Rising Star in 2010.
The 30-year-old Jenks, who underwent back surgery on December 30, was limited to 19 games with Boston in 2011 due to three stints on the disabled list. He went 2-2 with a 6.32 ERA (11 ER/15.2 IP) and 17 strikeouts. Signed by the Red Sox as a free agent on December 21, 2010, Jenks has posted a 3.53 ERA (140 ER/357.1 IP) and 173 saves while going 16-20 in 348 career Major League appearances over parts of seven seasons with the White Sox (2005-10) and Red Sox (2011).