The Red Sox have made their first big move of the offseason.

According to a source, the Red Sox have acquired veteran right-hander Sonny Gray from the St. Louis Cardinals.

The deal was first reported by Jon Heyman of the New York Post. According to ESPN’s Jeff Passan the Cardinals will receive right-hander Richard Fitts and minor league left-hander Brandon Clarke in exchange. The Red Sox will also receive cash considerations from the Cardinals to help cover Gray’s salary.

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Gray, a three-time All-Star, has pitched 13 seasons in the majors and is coming off a season in which he posted a 4.28 ERA with 201 strikeouts over 180.2 innings. The 36-year-old has been among the most durable starting pitchers in baseball throughout his career and has posted at least 165 innings in three straight seasons.

Gray projects to slot into the top of the Red Sox rotation behind ace Garrett Crochet.

This is a breaking news story, check back for further updates.