Reporters, as usual, were allowed to watch part of practice. When the No. 1 offense took its first snap, the same line that started the previous two games — Chad Clifton, Daryn Colledge, Jason Spitz, Tony Moll and Mark Tauscher, were on the field. Later, though, Wells rotated in at center, with Spitz taking Moll's spot at right guard.
"If we like what we see (after a week of practice), it's definitely an option," McCarthy said of Wells, who missed most of training camp and barely played in the preseason with back problems.
Meanwhile, McCarthy said safety Atari Bigby likely will miss Sunday's game with a hamstring injury. Fullback Korey Hall and tight end Tory Humphrey have knee sprains that will keep them out until Friday, and running back Ryan Grant likely won't practice until Friday, either, as he continues to improve from an injured hamstring. Cornerback Charles Woodson likely will not practice again this week.
"He's sore," McCarthy said. "He's just treating it as much as he possibly can, spending all that extra time in the training room. Just to report what the doctors (said), he came out of the game OK. That's the report."
The injury report after Wednesday's practice:
Limited participation: tackle Chad Clifton (knees), running back Ryan Grant (hamstring), guard Josh Sitton (knee), Wells (back).
Did not participate: Bigby (hamstring), Hall (knee), Humphrey (knee), Woodson (toe).
The big name on the Dallas injury report is safety Roy Williams, who coach Wade Phillips said would not play because of a broken arm.
"Other than that, I think we're fairly healthy," Phillips said.
Sitton returns, too
Through two preseason games, it appeared rookie Josh Sitton would be the starting right guard. A sprained knee ligament, however, sidelined Sitton for the final two preseason games plus the first two regular-season games.
Sitton returned on Wednesday, and said he felt fine after taking a "good amount of reps" at practice. Now, it's a matter of shaking off the rust and regaining his confidence.
"That's usually the main thing after an injury is you don't feel 100 percent confident you can do everything you did before," he said.