McClellan, who is scheduled to pitch two innings, missed the first two-plus weeks of Cactus League games while recovering from a sore shoulder, which was a byproduct of surgery he had on his throwing shoulder last July while still with the St. Louis Cardinals.
"I feel good. I've done everything I needed to get to this point, and its been a long time coming," said McClellan, who joined the Rangers as a free agent in January. "It's exciting to do all that work, rehab and the pain to get back to this point."
The 28-year old has pitched mostly out of the bullpen during his five-year MLB career, with the exception of 17 starts for the Cardinals in 2011. He posted a 12-7 record with a 4.19 ERA in 141 2/3 innings overall that season (43 appearances).
McClellan is a candidate for the open fifth starter job with the Rangers but could also provide depth to the bullpen if he doesn't win a rotation spot.
"I don't think he should be out there trying to impress anyone except himself," manager Ron Washington said. "All I want him to do is get through those two innings, get off that mound healthy, and if he does that it's progress."
McClellan will throw his two-seam fastball most often while mixing in a cutter, changeup and curve. He also throws his sinker often to force groundball outs, which should be to his advantage with an infield of Adrian Beltre, Elvis Andrus and Ian Kinsler behind him.
"Coming from St. Louis, we had a great defense there, as well, and you learn early on to use your defense," McClellan said. "That was one of the things that was attractive over here. You look around the infield and you have a lot of Gold Gloves flashing around."
Other injury notes:
LHP Matt Harrison threw two innings in this morning's 'B' game against Kansas City. He was scratched from his scheduled start Saturday due to inflammation of the second toe on his left foot.
RHP Joakim Soria (Tommy John surgery) will throw a bullpen session today, and RHP Colby Lewis (surgery - torn flexor tendon) will throw a bullpen session Thursday. RHP Justin Miller (Tommy John surgery) is also throwing bullpen sessions.
C Eli Whiteside (mild left calf strain) has resumed baseball activities and is expected to remain out of the lineup for a few more days. He is yet to run the bases, his last hurdle before playing in a game.
LHP Martin Perez (fractured left ulna) is not expected to resume a throwing program for approximately three weeks.