The Oakland Raiders lost 20-17 to the Cleveland Browns on Sunday, another tough home defeat in what has been a dreary season.
There was more bad news after the game, however, as Raiders coach Dennis Allen had to fly to the Dallas area to be with his father, former NFL linebacker Grady Allen, who has a serious health issue.
The first-year head coach is expected to rejoin the team Wednesday night, one day before the Raiders host the Denver Broncos on NFL Network's "Thursday Night Football" (8:20 p.m. ET).
"Coach Allen coached this game with a pretty heavy heart because his dad, Grady, is in very serious condition," a Raiders spokesman said, according to the San Jose Mercury News. "(He) will depart tonight to be with his dad."
Offensive coordinator Greg Knapp will run practices in Allen's absence and is expected to address the media Monday at the Raiders facility.
The Associated Press contributed to this story.