Receiver Larry Fitzgerald was feeling fine after the game, he said. He took a blow to the head in the first quarter and was evaluated by the team's medical personnel and cleared to return. Some fans via twitter assumed Fitzgerald had a concussion because they saw him sniff an ammonia capsule (or something like that). That's pretty common in the NFL and Fitzgerald said that he often does it before he takes the field. He seemed as clear-headed as usual after the game.
Fitzgerald is fine injury wise, but continues to be limited by poor QB and line play in Arizona. There is no light at the end of the tunnel here.