The Cubs are adding another southpaw to their relief corps.

The team is signing left-hand pitcher Caleb Thielbar to a 1-year deal, the team announced on Tuesday. The 37-year-old has pitched in parts of 8 seasons, all with Minnesota in an interesting professional career. With the move, the Cubs 40-man roster is full.

Last season he appeared in 59 games with the Twins, posting a 5.32 ERA and 1.56 WHIP in 47.1 innings with 3 saves, but is just a year removed from having been a solid relief option in Minnesota, when he posted a 3.23 ERA in 36 appearances with a 0.95 WHIP.

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He primarily relies on three pitches — a 4-seam fastball that sits around 93 mph, an 81-mph sweeper and a 74-mph curveball. In 2024, hitters found success on the fastball-sweeper mix, hitting .320 and .302, respectively, off the pitches. The season before, opposing batters hit below .200 against all three offerings.

The Cubs will hope they can incorporate him into their pitching setup and have him be a late-inning option for manager Craig Counsell. Last season, the Cubs struggled to find a consistent relief option from the left side. Mark Leiter Jr., a righty with reverse splits, primarily served in that role at the beginning of the year. Rookie Luke Little emerged as another option, but a shoulder injury ended his campaign early and Counsell had just Drew Smyly, a starter-turned-reliever in those situations.

Smyly is a free agent, and the team claimed former Cub Rob Zastryzny off waivers from Milwaukee at the beginning of the offseason. Thielbar gives Counsell a bonafide lefty with big-league experience.

Thielbar debuted in the majors in 2013, posting a 1.76 ERA and 0.83 WHIP in 49 games for the Twins. He made 54 appearances with a 3.40 ERA in 2014 and pitched in 6 games in 2015 with the Twins before being designated for assignment.

After spending most of 2015 in the minors with San Diego, he spent the 2016 and 2017 seasons with the independent St. Paul Saints. Thielbar would go on to pitch in the minors for Detroit, Atlanta and Minnesota, before returning to the majors in 2020. In the last 4 seasons, he’s appeared in at least 59 games three times and has posted a sub-3.50 ERA in 3 of those years.