Baltimore Orioles starter Bruce Chen is questionable for Thursday's scheduled start against Cleveland after spraining his left big toe while running the bases in the fifth inning of Baltimore's 5-4 loss to the Atlanta Braves on Saturday.

Chen sprinted to first base trying to beat out a double-play grounder. As he arrived at the bag, Chen stepped on first baseman Julio Franco's foot.

"I guess Franco was right on the bag and he stepped on him," catcher Sal Fasano said. "And we lost our starter because of it."

Chen recorded the first two outs in the bottom of the fifth, but couldn't continue after walking Marcus Giles.

"It's a little tender," Chen said. "I felt bad when I did it. I couldn't push off the rubber. It was a little frustrating."

Waiting for Bedard

With no starter having pitched more than 51/3 innings in the past week, the Orioles hope Erik Bedard will return soon from the disabled list, where he was placed May 26 with a strained ligament in his left knee.

"Sooner or later he's going to have to test it out," Manager Lee Mazzilli said. "You never know until you get on the mound."

Bedard, 5-1 before the injury, said he doesn't know when he will return to the rotation.

"It's more frustrating than anything else," Bedard said. "Going back they said two weeks. I didn't think it was that bad. But after that it wasn't even close to getting better. I just want to go out there and help the team."

Mora Still Sitting

Third baseman Melvin Mora, who has not played since straining his right hamstring on Tuesday, likely will miss the next two games. He has yet to try to run at full speed.

"I can put pressure on the leg, but I'm scared to run," Mora said. "I don't want anything to pop."

Mora said he would try to run on Monday, prior to the Orioles' game against the New York Yankees.