Buffalo fell to 0-2 on Sunday after a 31-20 loss to Los Angeles and will face the Vikings in Minnesota during Week 3.
"It's completely disrespectful to his teammates", Bills linebacker Lorenzo Alexander told reporters after the game.
A touching tribute from Davis to his younger brother, who no matter what anyone says, retired on his own terms.
That's because the 30-year-old retired at halftime, a fact he confirmed in a statement posted on the NFL's Twitter account.
"But I hold myself to a standard". He had been in the National Football League since 2009 with the Miami Dolphins and Indianapolis Colts. 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.
"While I was on the field, I just didn't feel right and I told the coaches 'I'm not feeling like myself, '" Davis said.