Perez is scheduled to start Tuesday's contest with the Boston Red Sox, and manager Ron Washington reiterated that as long as Perez isn't used in Monday's game he will get the nod Tuesday.
The left-hander has made four appearances with the Rangers this season, including two starts during his last stay with the big club.
"The guy proved he can pitch here," Washington said. "We didn't hesitate to bring him back."
Perez's first major league start came June 30 against Oakland, where he allowed two runs off six hits in 5 1/3 innings. His took the loss in his last start, allowing four runs -- two earned -- on six hits in six innings of work against the Twins.
He was sent back down to Round Rock on July 17. Perez said he feels confident being back with the big league club.
“I didn’t expect it so soon," Perez said through translator Eleno Ornelos. "If they brought me back, it’s because they trust me. And if they trust me, I have to do what they expect of me.”
Perez made just one appearance since returning to the Express. He allowed one run in two innings of work Friday. The Rangers held Perez to just two innings and 40 pitches as a safety net in case Lewis was placed on the DL. Perez is 5-5 with a 4.59 ERA in 16 appearances (15 starts) with Round Rock this season.
* Mitch Moreland begins his rehab assignment tonight with Triple-A Round Rock. Moreland has been on the DL since June 22 with a strained left hamstring. He'll spend tonight and Tuesday down there before returning home for the birth of his baby. He'll be with Double-A Frisco on Friday ans Saturday. Washington hopes to have him back with the big league club by Sunday.
* Texas begins a 10-game homestand tonight against the Red Sox. It's the first time the Rangers have been home since the All-Star break. They are 29-16 at home this season, including 14-5 since the beginning of June.
"I think every team plays better in their home ballpark," Michael Young said. "But our park has kind of taken a life of its own in the past couple of years. It's jammed up every night. The place is loud. The fans are energetic and into the game. As a player, you can't ask for anything more than that."
* Mark Lowe (ribs) threw off a mound for the first time Sunday.