ST. JOSEPH, Mo. -- Pro Bowl running back Jamaal Charles had his ailing right foot examined by two orthopedic surgeons and they confirmed the Kansas City Chiefs' diagnosis of a mild strain.

Charles turned his right ankle early in practice on Monday.

"His ankle ligaments were fine," Chiefs trainer Rick Burkholder said. "He had some pain on the outside bone of his foot. We did an X-ray. That was negative. There's a tendon that attaches right at that spot and that's what is sore right now. That's why we call it a strain."

Charles walked down the long, grassy hill to the practice fields Tuesday without a boot or a noticeable limp. He spent some time with the training staff off to the side, riding a stationary bike but only using the arm levers, before leaving the field for the rest of practice.

Burkholder said Charles felt some soreness up his leg but that it was expected.

"People are speculating Lisfranc and all that," Burkholder said of the mid-foot injury that caused problems for former Chiefs running back Larry Johnson. "He doesn't have any discomfort there. I've had him see two orthopedic surgeons and everyone agrees he has a mild foot strain."