Buffalo Bills' Vontae Davis retires at halftime

Veteran cornerback Vontae Davis quit on the Buffalo Bills at halftime of their home loss to the Los Angeles Chargers on Sunday.

"Pulled himself out of the game. He communicated to us that he was done," Bills coach Sean McDermott said after a 31-20 loss. McDermott provided no other details except to bluntly say, "No," when asked if Davis was injured.

Davis, 30, issued a lengthy statement posted on the NFL's Twitter account, announcing he is retiring after 10 seasons.

"This isn't how I pictured retiring from the NFL," he wrote. "But today on the field, reality hit me and hard. I shouldn't be out there anymore."

The 2009 first-round pick, who spent three years with Miami and six with Indianapolis, said he meant no disrespect to teammates and coaches.

"I hold myself to a standard," he wrote. "Mentally, I always expect myself to play at a high level. But physically, I know today that isn't possible and I had an honest moment with myself."

Arizona star receiver Larry Fitzgerald was sidelined by a hamstring injury Sunday. The 35-year-old Holy Angels product got hurt in the second half of the Cardinals' 34-0 loss at the Los Angeles Rams, finishing with three receptions for 28 yards.

Detroit cornerback Darius Slay, Denver right tackle Jared Veldheer and New England safety Patrick Chung and defensive end Trey Flowers were among a group of players diagnosed with concussions.

• Cleveland coach Hue Jackson told players during a meeting Saturday that the team would part ways with former All-Pro receiver Josh Gordon. "It was shocking, 'cause you don't really expect that, especially so sudden, especially the day before the game," Browns defensive tackle Larry Ogunjobi said. Added left guard Joel Bitonio: "He's a good guy and you hope he gets all the help he can get and he stays out of trouble."

• Two players were ejected Sunday: Atlanta safety Damontae Kazee for a vicious hit to the head of Carolina quarterback Cam Newton, and Detroit running back LeGarrette Blount for coming off the sideline to push San Francisco's Elijah Lee after the linebacker pushed Lions quarterback Matthew Stafford out of bounds in what appeared to be a legal play.