Texans running back Arian Foster will be ready to play in Week 1 of the regular season. Foster strained his left hamstring on Saturday night in a preseason game against the 49ers, but the NFL's reigning rushing champion says the injury in mild and improving. "I'm okay," Foster said. "It's a lot better than I thought it was. I'm already jogging." Foster's strained hamstring that cost him two weeks of camp is worse than the one he suffered Saturday. "It's never a good thing to have experience with hamstring problems, but, unfortunately, with my track record, I do," he said. "It was just a mild strain. It feels good."

The 49ers have activated receiver Michael Crabtree from the physically unable to perform list. The move comes one day after the team notified the NFL that Crabtree caught a couple dozen passes during warm-ups while still on the list. Crabtree hurt his foot during workouts led by quarterback Alex Smith in June during the lockout.

Browns starting offensive guard Eric Steinbach is out for the season with a back injury. Steinbach underwent back surgery on Tuesday to repair a "disk issue." Cleveland coach Pat Shurmur said the surgery went well, but that the team will place Steinbach on injured reserve, ending his season.

49ers coach Jim Harbaugh says "it's possible" that wide receiver Michael Crabtree could return to practice this week. Crabtree is recovering from a broken foot. According to a source, Crabtree fractured his left foot during a player-run practice in San Jose on June 6. He had surgery on the foot before the start of training camp. He is unlikely to play in San Francisco's preseason finale and his status for Week 1 is undetermined.

Cowboys tight end Martellus Bennett could miss the season opener against the Jets and possibly more games with a right high-ankle sprain. Bennett, who sprained the ankle in the third quarter of Saturday night's preseason game against the Vikings, is expected to miss two to four weeks. With Bennett out, the two main tight ends are starter Jason Witten and John Phillips, who missed all of last season with a torn ACL.

Broncos linebacker D.J. Williams has a dislocated right elbow that could sideline him up to a month. Williams was hurt in Denver's 23-20 win over Seattle on Saturday night. "It's unfortunate because he's one of our leaders," Champ Bailey said. "But you've got to just keep on ticking and he knows that. He's going to do whatever he can to get back as soon as possible. He's got to make sure he takes care of himself." Williams left the stadium after the game in a sling with his right arm heavily taped from his wrist to his biceps.

Texans coach Gary Kubiak is optimistic Arian Foster will be ready for the regular-season opener. Foster re-aggravated a hamstring injury in Saturday's preseason game in San Francisco. The NFL's leading rusher in 2010, Foster left the field in the first quarter of Houston's 30-7 victory, favoring the left hamstring that he strained early in training camp. "Looks like we're dealing with the same thing we were dealing with at the start of camp," coach Gary Kubiak said. "Hopefully, we can get him back on the rehab train, and get him ready for opening day. He'll be day to day."

Patriots wide receiver Wes Welker, who injured his neck while making a tackle during the team's preseason game against the Lions on Saturday night, says he will be fine. Welker made the tackle after Tom Brady threw an interception. After the game, Walker told The Boston Herald that his neck was "OK." "He's a tough guy," Brady said. "There's nobody tougher than Wes Welker. He's mentally, physically, he's as good as there is. He's a huge part of our offense."

Browns wide receiver Mohamed Massaquoi returned to practice for the first time on Sunday. It was his first football-related action since coming to camp with his left foot in a cast and clouded by mystery. "It was a bone chip, but I'm not sure when or where it came from," Massaquoi said. "I didn't know it until I got here." Massaquoi's injury was never disclosed until he came off the field Sunday. He revealed that he got hurt during "Camp Colt," a series of workouts hosted in Texas by Browns quarterback Colt McCoy. That was during the NFL lockout, which delayed the opening of all training camps.

Steelers backup quarterback Byron Leftwich broke his left arm in Pittsburgh's preseason victory over Atlanta on Saturday. According to reports, the injury will likely end Leftwich's season. Leftwich was slated to be the Steelers' No. 2 quarterback behind starter Ben Roethlisberger this season.