Fitzgerald sustained a concussion attempting to recover an onside kick in the fourth quarter, ESPN's Adam Schefter reported. Ellington was dealing with a thigh bruise.
Fitzgerald also was evaluated for a concussion last October and suffered one late in the 2010 season. He will have to go through league-mandated protocol to suit up for Week 16 at the Seattle Seahawks.
Here are the rest of the injuries from around the league:
1. Giants wide receiver Victor Cruz also sustained a concussion as well as a knee sprain in the third quarter of Sunday's loss to the Seahawks. Coach Tom Coughlin couldn't say after the game whether Cruz would be shelved for the final two games in a lost season.
3. Colts starting running back Donald Brown didn't return to the game after suffering a "stinger" in Sunday's blowout victory over the Texans. In his absence, Trent Richardson cleared 100 yards from scrimmage for the first time this season.
5. Bills defensive end Marcel Dareus never returned after coming down with an ankle injury of his own. On a torrid stretch the past couple of months, Dareus joined Kyle Williams to collapse the pocket on Chad Henne in Sunday's victory.
7. Bengals linebacker James Harrison is doubtful to return to the same game after showing concussion symptoms. Punter Kevin Huber was knocked out with a fractured jaw, forcing kicker Mike Nugent to expand his duties.