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06/22/08 2:40 PM ET

Perez ready for action after rehab start

Nationals pitcher hurled four pain-free innings Saturday

WASHINGTON -- Nationals left-hander Odalis Perez said his shoulder is OK after pitching four innings for Class A Potomac on Saturday. He is expected to come off the disabled list Friday and pitch against the Orioles at Nationals Park. For now, Perez will be limited to 80 pitches in that game.

Perez hasn't played in a game since June 3 due to left shoulder tendinitis, and has missed three starts.

"There's no pain and I feel good," Perez said. "Today, I feel like I can go on Friday."

Meanwhile, infielder Aaron Boone did some leg exercises and took batting practice in the cage Sunday. He said his left knee is "all right." Manager Manny Acta said Boone will be pinch-hitting for the next few days.

Boone said he felt pain in the knee when Washington played on the turf at the Metrodome in Minnesota.

"Structurally, I'm pretty sound. I'm not too concerned that it's anything serious," Boone said.

Bill Ladson is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.