Mejia signed a minor league contract with the White Sox in January and had been working out at the team's alternate training site. The 26-year-old lefty holds a career 4.62 ERA at the MLB level.

Mejia was designated for assignment and released by the Angels earlier in the month, but he'll still get a shot to earn a roster spot after being invited to the White Sox's big-league camp. He's not particularly likely to do so, however, as he struggled to a 6.61 ERA and a 14.5 percent walk rate in 31.1 innings for the Twins, Cardinals and Angels last season.

Mejia was designated for assignment on Tuesday, and after clearing waivers, he's headed for free agency. He spent time with St. Louis, Minnesota and Los Angeles in 2019, posting a 6.61 ERA and 1.72 WHIP with a 30:21 K:BB across 31.1 frames out of the bullpen.

Mejia made 35 major-league appearances with the Twins, Cardinals and Angels in 2019, but he struggled with a 6.61 ERA and 1.72 WHIP. The southpaw has reached the majors in each of the past four seasons, but he has failed to make much of an impact in limited action.