IRVING -- The playing status of starting right tackle Marc Colombo and starting guard Kyle Kosier is in question as they continue to rehab from knee injuries.
A realistic return for Kosier is probably Week 2 vs. Chicago.
Colombo is another story. He could play in the regular-season opener at Washington on Sunday night, but if he doesn't practice on Wednesday the chances of him playing lessens.
"If he practices Wednesday, I'll be more optimistic," coach Wade Phillips said.
Phillips said if Colombo doesn't practice this week, he won't play vs. the Redskins.
Montrae Holland replaces Kosier and Alex Barron replaces Colombo.
Also, wide receiver Roy Williams did return to practice after missing a session last week due to a strained lower back and hip flexor.
"He said he felt good," Phillips said of Williams.