Sunday was not a very good day for the Buffalo Bills.

The Bills fell 31-20 to the Los Angeles Chargers in their home opener and saw their veteran cornerback literally retire at halftime.

Apparently their star running back endured a painful injury, too: LeSean McCoy suffered fractured ribs in Sunday’s game, NFL Media’s Ian Rapoport reported Monday morning.

#Bills RB LeSean McCoy suffered fractured ribs during yesterday’s loss to the #Chargers, source said. It’s an injury that does not necessarily rule him out for Week 3, though. He’ll attempt to play through it. — Ian Rapoport (@RapSheet) September 17, 2018

As Rapoport notes, McCoy actually may try to play in Week 3 against the Minnesota Vikings. But he still was in considerable pain after the game, according to ESPN’s Mike Rodak.

LeSean McCoy declines an interview request, saying he is having trouble speaking because of his rib injury. He’s wincing as he moves around to get dressed. — Mike Rodak (@mikerodak) September 16, 2018

The 30-year-old exited the game in the second half after Bills center Ryan Groy appeared to fall on him after a tackle. He briefly returned to the game but later left for good, finishing the day with 39 rushing yards on nine carries to go with 29 receiving yards on four catches.

The 0-2 Bills aren’t exactly deep at running back — Chris Ivory and Marcus Murphy are the other two backs who received carries Sunday — so they’ll be praying McCoy can battle through his ailment.

Thumbnail photo via Timothy T. Ludwig/USA TODAY Sports Images