Brett Favre said before Monday's preseason game that he believes he has a cracked rib. The Vikings quarterback hasn't received an official diagnosis, but has had difficulty with deep breathing. Favre wasn't listed on Minnesota's injury report.

Chiefs quarterback Matt Cassel could miss two-four weeks with a strained MCL in his left knee. Yahoo! Sports, citing a source within the organization, is reporting that the injury could keep Cassel out for the team's season opener. He was hurt Saturday night when sacked on the third play of a preseason loss to Seattle.

X-rays did not reveal a broken bone in Roy Williams' shoulder or collarbone, two sources told Todd Archer. Williams' suffered a sprained left shoulder when he collided with Orlando Scandrick near the end of Thursday night's open practice. RealGM Note: One media site reported Williams had a broken clavicle, but that now appears inaccurate.

The Steelers held quarterback Ben Roethlisberger out of Saturday's preseason game after he injured his Achilles tendon this week. Pittsburgh battled Washington on Saturday night. The injury isn't thought to be serious, but Charlie Batch started in his place.

Quarterback Ben Roethlisberger injured his right Achilles tendon when tackle Max Starks stepped on it during the Steelers' practice Thursday, s reported by ESPN.com. Roethlisberger was expected to be re-examined Friday and his playing status for the team's game against the Redskins remained undecided. However, he did travel with the team Friday to Washington, D.C., according to the Pittsburgh Post-Gazette.

Texans backup quarterback Rex Grossman will miss about a month of action with a hamstring injury. Houston is looking for another quarterback to fill in until the former Bears starter in healthy. Grossman was injured in Saturday's win over the Chiefs and coach Gary Kubiak says he doesn't feel comfortable finishing the preseason with only Matt Schaub and backup Dan Orlovsky.

Broncos running back Knowshon Moreno has a mild MCL sprain in his knee, according to sources. An MRI revealed the injury on Saturday after the rookie running back was hurt in Friday's preseason game against the 49ers. He'll miss some time in the preseason, but is expected to be ready for the team's regular-season opener on Sept. 13.

Broncos rookie running back Knowshon Moreno was scheduled to undergo an MRI on Saturday following a knee injury suffered on Friday night. Moreno, the 12th overall pick, hurt his knee in the team's first preseason game. Initial reports are that the knee has been sprained.

Giants rookie running back Andre Brown will miss the entire 2009 season after rupturing his left Achilles' tendon. "I don't know how it happened," coach Tom Coughlin said through a team spokesman, according to the Star Ledger. "Andre was running his route side by side with the linebacker." Brown was fourth on New York's depth chart at running back behind Brandon Jacobs, Ahmad Bradshaw and Danny Ware.

Panthers receiver Steve Smith made a surprise return to practice on Friday. Earlier this week, Smith left the team during practice with what he thought was a broken shoulder. "It doesn't hurt as much. Sleep is kind of difficult, but it's all right," said Smith, according to the Associated Press. "I wouldn't say I woke up and said, 'OK, I'm healed.' But it's getting more tolerable." He told the press that he suffered a "pretty good bone bruise." X-rays were negative Monday night.