Lineman will undergo ankle surgery Wednesday
Williams will miss the remainder of the season. He will undergo surgery Wednesday, ABC's Michelle Tafoya reported during the broadcast.
Williams had changed direction to chase scrambling quarterback Jake Plummer when Foster dived at his lower leg. Williams, part of the Bengals' defensive line rotation, didn't attempt to get up.
Foster went over to Williams as he sat on the cart that would take him from the field, said a few words and gave him a pat. Tests found that he broke and dislocated the ankle, ending his season.
The Bengals have been hit hard by injuries this season, with 10 players already on injured reserve.
Information from The Associated Press was used in this report.
MORE NFL HEADLINES
- Agent: Peppers joins Packers on 3-year deal
- Jags WR Blackmon OK after single-car crash
- Steve Smith reaches 3-year deal with Ravens
- Colts strike deal with former Giants WR Nicks
MOST SENT STORIES ON ESPN.COM
- Antigua Men's Cincinnati Bengals Point Polo