"I won't go into all the details about it, but he took a pretty good hit," Caldwell said. "He was out, unconscious for a period of time."
It was a scary scene that had the Linc silent while Collie lay on the ground for several minutes Sunday. Trainers worked on him, then Collie was placed on a stretcher as players from both sidelines stood and watched.
"Coach Caldwell told us early it was a concussion and you don't like to hear that," Peyton Manning said. "It's better than what everybody fears at that point."
The second-year receiver dropped a pass over the middle after he was hit by safeties Quintin Mikell and Coleman. Although Mikell was penalized for hitting a defenseless receiver, replays showed Coleman made contact with Collie's helmet.
Since the NFL cracked down on hits to the head and neck area on Oct. 19 after a spate of them the previous weekend, there were few such fouls. The league has threatened suspensions for illegal hits to defenseless players, saying they have no place in the game.
"I think the official made the proper call," Caldwell said.
Collie had one catch for minus-1 yard Sunday. He entered the game with 44 receptions for 502 yards and six touchdowns.
He was concerned about Collie, and at the same time wondered about the penalty -- Jackson thought the hits on Collie were clean.
"I just hope they don't take this ruling and try to change football," he said.
Robinson was fined $50,000 for the hit. For flagrant fouls that same day, Pittsburgh linebacker James Harrison ($75,000) and New England safety Brandon Meriweather ($50,000) also drew hefty fines. The league announced it would then dole out suspensions along with fines for illegal hits.
Copyright 2010 by The Associated Press