Defensive tackle Kevin Williams walked off the practice field after limited participation and gave a positive report on his first practice since suffering a severely strained right knee in the third preseason game at San Francisco.

"We went out to see how it felt," he said. "And it felt great."

But that's not the end of it. Not yet.

"Questions?" Williams said when asked if there were any questions that he would play on Sunday at Chicago. "I'll tell you tomorrow. Hopefully, it won't be sore tomorrow and we'll go from there."

If Williams gets up Thursday with unusual soreness, the Vikings are likely to back off and not practice him on Thursday. If he's not too sore, the Vikings will ramp up his work when they put the pads on for an afternoon practice. Either way, he'll only be limited in Thursday's practice.

"[Thursday morning] is pretty much the key," Williams said.

Also on today's injury report as being limited were cornerback Josh Robinson (quadriceps), center John Sullivan (knee) and right tackle Phil Loadholt (knee). Those three are expected to play on Sunday.

Two starters -- middle linebacker Erin Henderson (heel) and strong safety Jamarca Sanford (shoulder) -- are on the injury report but had full particpation in today's practice.