Calais Campbell to play Thursday

Arizona Cardinals defensive end Calais Campbell, who was carted off the field Sunday and spent the night in a hospital, will play Thursday night against the Seattle Seahawks, a league source told ESPN NFL Insider Adam Schefter.

Campbell suffered a "bruised spine," according to Cardinals coach Bruce Arians, during Sunday's 32-20 loss to the San Francisco 49ers. He was carted off the field on a stretcher and taken by ambulance to Stanford Hospital, where he underwent a battery of tests before being released late Sunday.

Some fans started a wave in the stadium Sunday while the game was delayed after Campbell's injury, upsetting the 49ers, with CEO Jed York and left tackle Joe Staley later tweeting their disapproval of the fans' actions.

Arians said Tuesday night on SiriusXM NFL Radio that he was optimistic Campbell would be ready to play. When the injury report was released Wednesday, Campbell was listed as questionable.

"I feel pretty good. I feel healthy," Campbell said Wednesday. "The biggest thing is just making sure I can protect myself. Anytime you're out there playing football, you've got to be able to protect yourself, and as long as I'm confident that I can do that, I'm going to play football."

Campbell wouldn't specify whether his neck and back were still bothering him, just that he had the aches and pains that come with playing the game.

ESPN NFL Insider Adam Schefter and ESPN.com Cardinals reporter Josh Weinfuss contributed to this report.