Lewis went on the DL June 26, retroactive to June 24, with right forearm tightness. He hasn't pitched since June 23, when he allowed eight runs -- seven earned -- on 12 hits over four innings against the Colorado Rockies. Lewis is 6-6 with a 3.51 ERA in 15 starts this season and will start Texas' series finale against Oakland on Wednesday afternoon.
To clear up a spot on the active roster, the Rangers optioned left-hander Martin Perez to Triple-A Round Rock. Perez was recalled from Round Rock on June 26 and went 1-1 with a 5.54 ERA in four games -- two of them starts -- in his first stint in the Majors.