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12/05/11 10:34 PM EST

Nationals still trying to add veteran to rotation

Club eyes free agents Buehrle, Oswalt; trades also possibility

DALLAS -- The Nationals continue to search for a veteran starting pitcher to guide a young rotation that includes Stephen Strasburg and Jordan Zimmermann.

It's well known the Nationals are trying to sign left-hander Mark Buehrle or right-hander Roy Oswalt, who are free agents.

Despite reports that the Nationals offered left-hander C.J. Wilson a six-year deal, a baseball source said the club did nothing of the sort. Wilson is not on Washington's radar.

General manager Mike Rizzo said he would prefer not to give a no-trade clause to potential acquisitions, but he would give it to the right person. Last offseason, the team gave Jayson Werth a no-trade clause. Reports have indicated Buehrle would like a no-trade clause in his contract.

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"But for the right player and the right fit, I think you have to be open-minded and flexible enough to at least think about it and talk about it," Rizzo said.

If the Nationals are unable to sign a free agent, Rizzo is open to trading for a starting pitcher. It's not known who the Nationals are trying to acquire via trade.

"Those are valuable pieces to any club. And to acquire one, it would be painful in the players you would have to give up," Rizzo said. "We are not going to make a trade just to make a trade. Just because we have depth, we are not going to automatically trade from that depth."

Bill Ladson is a reporter for MLB.com and writes an MLBlog, All Nats All the time. He also could be found on Twitter @WashingNats. This story was not subject to the approval of Major League Baseball or its clubs.