KANSAS CITY, Mo. (AP) — The Chiefs have placed Pro Bowl safety Eric Berry on the non-football illness list after a mass was discovered in his chest following Thursday night’s game in Oakland. Berry began feeling discomfort in his chest near the end of the game, and a series of tests taken in Oakland and back in Kansas City revealed the mass. Chiefs trainer Rick Burkholder said that there has been no definitive diagnosis, but the leading possibility is lymphoma.

Burkholder said that Berry had never complained of the pain until last week, and a physical taken over the summer came back clear. Berry was on his way Monday to Atlanta, where he was to be examined by specialists at Emory University.