The Chiefs listed Butker as out -- as did the Chargers with Allen and tight end Donald Parham Jr. (hamstring) -- for the game on their final injury report of the week.
The Chiefs this week signed former New York Jets kicker Matt Ammendola to their practice squad, and he could be elevated to their active roster in time for Thursday night's game. Ammedola, who kicked for the Chiefs during their only practice session of the week on Tuesday, made 13 of 19 field goals for the Jets last season.
Butker injured his left ankle on a kickoff during Sunday's win against the Cardinals in Arizona. Coach Andy Reid blamed the injuries to Butker and cornerback Trent McDuffie on what he said was loose turf on the recently re-sodded field in Arizona.
McDuffie was placed on injured reserve this because of a hamstring injury.
After his injury, Butker made three PATs and a 54-yard field goal. Safety Justin Reid handled kickoffs and went 1-of-2 on PATs.
Chargers coach Brandon Staley had said Tuesday that it wasn't "looking great" that Allen, who has been selected to five Pro Bowls in his career, would be able to play on Thursday night. Allen had four catches for 66 yards before departing in the first half on Sunday because of his injury.
Also, Chargers cornerback J.C. Jackson was limited Wednesday and is officially questionable. He has a "50-50" chance of playing, Staley said earlier this week.
"He's improving," Staley said Tuesday. "He's headed in the right direction, but I think there is still a lot to be decided before game time on Thursday night."
Jackson underwent ankle surgery on Aug. 23 and was given a two-to-four week timetable to return. He was inactive against the Raiders.
ESPN's Lindsey Thiry contributed to this report.