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With Lewis out for the season and Oswalt ailing, the AL West leaders must quickly evaluate what moves they might want to make before the July 31 trade deadline. Fellow starters Neftali Feliz and Derek Holland have all spent time on the DL this season. Texas reliever Alexi Ogando, who has started in the past, recently came off the disabled list.

General manager Jon Daniels said the Rangers have been “monitoring the market.”

“We’ve had guys out there looking and had conversations with clubs,” Daniels said.

Daniels said Feliz has at least two more scheduled starts for Triple-A Round Rock. Holland is slated to pitch Wednesday against Boston. Oswalt was examined by Dr. Mike McCann on Monday in Houston, where he received an injection in his lower back.

According to a Rangers spokesman, Oswalt is optimistic that he will return for his next scheduled outing Sunday against the Chicago White Sox. Ogando came back last Tuesday and has pitched three innings in four games out of the bullpen. Daniels said he could be a candidate to be moved into the starting rotation.

Lewis had Tommy John surgery on his pitching arm in high school and right shoulder surgery in 2004.

“(Losing Lewis) is a blow for us, but it’s something we’re going to recover from,” Daniels said. “It’s an opportunity for someone to step up. I feel bad for Colby, he’s been a warrior. He’s pitched a ton of innings and he’s been such a leader by example.”

Washington acknowledged that Perez pitched only two innings in his latest minor league appearance Friday night against Omaha because of the concern over Lewis‘ status.

“If he starts (Tuesday), there is no pitch limit. It would just depend on how effective he is,” Washington said. “The guy has proved he can pitch here, so we didn’t hesitate to bring him back. I told him he would be back when a situation presents itself, and it presented.”