Johnson and left tackle Duane Brown could miss Sunday's game at Baltimore with injuries.
Coach Gary Kubiak said Tuesday that Johnson would be subject to the NFL's concussion protocol and didn't anticipate knowing the Pro Bowl wide receiver's status until late in the week.
Brown is battling turf toe and said he'll be a game-time decision against the Ravens this week.
--Indianapolis Colts tight end Dwayne Allen is facing season-ending hip surgery, coach Chuck Pagano said.
Allen was injured in the Colts' season opener against the Oakland Raiders on Sept. 8 and sat out last Sunday's loss to the Miami Dolphins. He had one catch in the opener that resulted in a 20-yard touchdown.
As a rookie last season, Allen started all 16 regular-season games and had 45 receptions for 521 yards and three touchdowns.
With Allen lost for the season, the burden at tight end falls on second-year pro Coby Fleener. Dominuque Jones also could see more playing time.
Last week, the Colts lost starting running back Vick Ballard for the season with a knee injury.
--Washington Redskins safety Brandon Meriweather was fined $42,000 by the NFL for his hit on Green Bay Packers running back Eddie Lacy during Sunday's game.
Meriweather will not face a suspension despite being a repeat offender of the NFL rule that prohibits leading with the helmet on a tackle. His fine was the same as Tennessee Titans safety Bernard Pollard received on Wednesday for an illegal hit on Houston Texans receiver Andre Johnson that resulted in a concussion.
But Meriweather's financial penalty was far less than the $100,000 levied against Tampa Bay Buccaneers safety Dashon Goldson earlier Wednesday for head shots in Weeks 1 and 2.
Lacy suffered a concussion as a result of Meriweather's helmet to his chin.
Later in Sunday's game, Meriweather sustained a concussion when he tackled Packers running back James Starks.
Green Bay coach Mike McCarthy announced Wednesday that Lacy was progressing through the concussion recovery protocol but that Starks would start Sunday against the Cincinnati Bengals.
--The Cincinnati Bengals placed defensive end Robert Geathers on season-ending injured reserve and re-signed safety Jeromy Miles.
Geathers suffered an elbow injury during Monday night's win over the Pittsburgh Steelers. A former starter, Geathers was the team's No. 3 defensive end this year and had no tackles in two games.
The 30-year-old veteran has spent his entire 10-year NFL career with the Bengals (1-1).
Miles was waived Monday and then brought back to fill the roster vacancy left by Geathers. Miles is in his fourth year in the league, all with the Bengals, and has played in 39 games. He led Cincinnati in special teams tackles in 2011 and was second last year.
The Bengals also signed free agent cornerback Curtis Marsh and waived linebacker J.K. Schaffer, who had been promoted from the practice squad for Monday night's game.