Gregory Santos is headed to the Seattle Mariners.

The Chicago White Sox traded the 24-year-old Dominican professional baseball pitcher, a right-handed reliever, to the American League West division team.

From Seattle, the White Sox received a package that includes a pair of players on the Mariners’ 40-man roster — hard-throwing right-hander Prelander Berroa and outfielder Zach DeLoach — as well as the 69th pick in the 2024 draft.

Santos, a well-regarded player, joins a Mariners bullpen that already boasts Andres Muñoz and Matt Brash, two of the nastiest relievers in Major League Baseball.

With a fastball that sits at 99 mph and a 92-mph slider, Santos thrived in his first full season with the White Sox, posting a 3.39 ERA and a 2.65 Fielding Independent Pitching number on account of allowing just two home runs with a nearly 4-to-1 strikeout-to-walk ratio in 66.1 innings.

With five years of team control on Santos, the Mariners were willing to give up Berroa, 23, whose stuff is similar to Santos’, with a fastball that hits triple digits and a hard-breaking slider. A starter for most of his minor league career, Berroa spent last season mainly as a reliever and debuted with Seattle toward the end of the 2023 season after posting a 2.89 ERA and striking out 101 in 65.1 innings at Triple A.

Seattle had added DeLoach, 25, to their 40-man roster this winter after a standout season at Triple A, where he hit .286/.387/.481 with 23 home runs and 88 RBIs. The left-handed-hitting DeLoach was a second-round pick. The 69th choice, with a slot value of around $1.1 million, was eligible to be traded because it is a competitive-balance pick.