The Rangers continued the pitching theme of the offseason Tuesday: Add pitchers on the mend.

The club agreed to a minor-league deal with 28-year-old right-hander Rafael Montero, according to a source. Montero pitched for the New York Mets from 2014-17 but missed this past season after undergoing Tommy John surgery late in spring training. He is expected to be ready to return sometime in May or early June.

Montero made 18 starts for the Mets in 2017 and pitched 119 innings, compiling a 5-11 record and 5.52 ERA. In 30 career major-league starts, he has averaged 8.3 strikeouts per nine innings.

The Rangers also lost a Tommy John rehabber: Former first-round pick Chi Chi Gonzalez. Gonzalez, who hasn't pitched in the majors since 2016, signed a minor-league deal with Colorado. Gonzalez tried to rehab his injury in 2017, but he ended up having surgery late in the year and did not return to the mound until late last season at the lowest levels of the organization.

He is pitching for Licey in the Dominican Republic this winter and is 2-3 with a 1.91 ERA.

Gonzalez, who turns 27 in January, was the Rangers' first-round pick in 2013. He reached the majors two years later and rolled off a 0.90 ERA, including a three-hit complete game shutout in his first four starts. Since then, though, he has hit hard times. He has a 6.85 ERA in 47.1 innings over 13 appearances (nine starts).