ORCHARD PARK, N.Y. -- Welcome to Ralph Wilson Stadium, where the Buffalo Bills (5-3) host the Kansas City Chiefs (5-3) at 1 p.m. ET Sunday.

Weather conditions: Another great fall day for football. Temperatures are in the low 40s and skies are partly cloudy. There is a slight chance of a shower Sunday morning, but no precipitation is expected in the afternoon. Winds are forecast at 13 mph.

Monitoring Sammy Watkins and Fred Jackson: The expectation is that the Bills will put both Watkins and Jackson, who each have groin injuries, through a pre-game workout. Of the two players, Jackson would seemingly have the better chance to be active. He practiced all week -- albeit on a limited basis -- while Watkins didn't practice after leaving Wednesday's session.

No players declared out: The Bills do not have any players declared out for the game, meaning they are relatively healthy across the roster. One position to watch with the inactives is the offensive line, where backup Cyril Richardson did not practice this week because of a death in the family. He could be a healthy scratch, paving the way for Cyrus Kouandjio to be active for the first time this season.

Allen gets the call: Brad Allen, a first-year NFL official, is the referee for Sunday's game. He also officiated the Bills' season opener in Chicago.