Tennessee Titans quarterback Vince Young left Sunday's 13-10 loss to the Tampa Bay Buccaneers with a quadriceps strain.
The Titans said Young's return was probable, but he never re-entered the game, and Tennessee had to rely on backup Kerry Collins.
"He tried to stay loose if he could, in case we had an issue with Kerry," coach Jeff Fisher said. "At this point, he'll just be day to day, but it was not something he could have played effectively with."
Arizona quarterback Kurt Warner left the Cardinals' 25-10 loss to Carolina with a sprained left elbow in the first quarter. Warner, a two-time NFL MVP, made his first start of the year in place of Matt Leinart, who is out for the season with a broken collarbone.
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Already missing starting running back Laurence Maroney, the New England Patriots lost his backup, Sammy Morris, to a chest injury during their 48-27 win over the Dallas Cowboys. Tight end Benjamin Watson hurt his ankle in the second quarter when he was tackled near the sideline by Roy Williams after making a catch. Watson was slow getting up, then walked up and down the sideline a few times before being taken to the locker room.
Cowboys cornerback Anthony Henry, the NFL leader with four interceptions, was out for the second straight game with a high right ankle sprain. Jacques Reeves started in his place.
Rams QB Marc Bulger said he should be ready to play next week. Wide receiver Drew Bennett left the game with a hamstring injury in the second quarter, further depleting St. Louis' thin receiving crew. Rams center Brett Romberg (left ankle) and defensive end Leonard Little (sprained left toe) were also injured.