Perez was moved to the bullpen Thursday, Shawn McFarland of the Dallas Morning News reports.
The 32-year-old lefty is the odd man out in the Rangers' rotation after the club acquired both Max Scherzer and Jordan Montgomery ahead of Tuesday's trade deadline. Perez was excellent for Texas in 2022, even earning his first career All-Star nod, but he's struggled to a 4.98 ERA, 1.52 WHIP and 69:41 K:BB through 108.1 innings (20 starts) this season.