The Buffalo News reported Thursday, citing a police source, that Erie County Sheriff's deputies found Kouandjio partially clothed in a field after he'd climbed over an electric fence. Kouandjio had abandoned his vehicle on a Buffalo-area highway.
Kouandjio was taken to Erie County Medical Center.
"We're going through the process right now of gathering the information, and that's all I can tell you at this time," Bills coach Sean McDermott said Thursday.
The Bills' second-round pick in 2014, Kouandjio had been recovering from hip surgery resulting from a fall at home, the team announced in January. He is expected to be ready for training camp.
Kouandjio started five games last season in place of injured left tackle Cordy Glenn. In 25 career games, Kouandjio has made seven starts.