Fox collapsed while playing golf in Charlotte, N.C., in early November during the Broncos' bye week. He underwent heart valve surgery and returned after a month away.
"I've come pretty far," he said. "It was something I was born with. I came back pretty early. I hope to be doing this a lot longer.
"Watching the Seahawks and knowing Pete Carroll for so many years, I have the utmost respect for them. I think for the fans, it's an incredible matchup."
As it is for the two coaches after all these years.