Injury report: DeMarcus Ware (hamstring) probable

IRVING, Texas -- Pro Bowl outside linebacker DeMarcus Ware is listed as probable for Sunday's game against the Seahawks despite being limited in practice all week.

The Cowboys are exercising caution with Ware because of a hamstring strain he originally suffered midway through training camp. Ware, an eight-year veteran, has never missed a game in his NFL career and said Thursday he will be ready to play full speed.

Ware could be facing a backup left tackle. Seahawks coach Pete Carroll said starter Russell Okung (knee) will be a game-time decision. Seattle receiver Sidney Rice will play despite a knee injury, Carroll said.

As expected, Cowboys nose tackle Jay Ratliff has been ruled out for the second consecutive week. Ratliff suffered a high ankle sprain in the Aug. 25 preseason game against the St. Louis Rams. He'll be replaced by Josh Brent and Sean Lissemore, who both played well in the season-opening win over the New York Giants.

Center Phil Costa (back) has also been officially ruled out. Costa played only three snaps in the season opener. Ryan Cook, who was acquired in a trade from the Dolphins the previous week, filled in adequately despite having practiced only a few times with the Cowboys. Cook got all the first-team reps this week.

Rookie safety Matt Johnson (hamstring) is also out.