Less than a year after winning the Super Bowl with the Denver Broncos, Coach Gary Kubiak is stepping down after Sunday’s regular-season finale. Before the game, ESPN first reported that as a likelihood, and then afterward, Broncos players confirmed that Kubiak said he would retire.

The concerns of Kubiak’s family about his health are a big consideration, ESPN’s Adam Schefter reported, citing multiple league sources. Kubiak, 55, is finishing his second season in Denver, but, as was the case when he coached Houston, he has had health issues. He took a week’s leave of absence in October for what the team said was a “complex migraine condition” that caused extreme fatigue and weakness. Joe DeCamillis, the special-teams coach, filled in for him as head coach during a Thursday night game that week in San Diego.

Following a 24-6 win over the Raiders, one that gave the Broncos a 9-7 record but still left the team out of the playoffs, Kubiak said to the media members that he would address his situation on Monday.

“I love [Kubiak],” Denver quarterback Trevor Siemian said after helping beat Oakland. “I owe him a lot. I had no business being drafted, no business being around. So I owe him for giving me a chance.”

“I love this league. I love the Broncos. I love this work. I’m all in on the [Oakland] Raiders right now,” Kubiak told reporters on Friday. “There will be time for reflection and all of that stuff next week.”

Kubiak, who coached the Texans for eight seasons, suffered a mini-stroke (a transient ischemic attack) during a game in 2013 and was rushed to a hospital. During a TIA, a blood clot temporarily blocks the flow of blood to the brain. Kubiak fully and quickly recovered.

Kubiak’s team enters the finale against Oakland with an 8-7 record and has been eliminated from the playoffs. With Kubiak as head coach, the Broncos are 20-11 in the regular season and won Super Bowl 50. Before he took over the Texans, he was the offensive coordinator for Mike Shanahan’s Broncos teams that won Super Bowls in 1997 and 1998. His history with Denver also includes nine years as a backup quarterback, playing behind Hall of Famer John Elway, who is now the team’s general manager and executive vice president for football operations.

There currently are three head-coaching vacancies in the NFL, with the Jacksonville Jaguars, Buffalo Bills and Los Angeles Rams. The San Francisco 49ers are reportedly planning to join them in looking for new hires when the regular season ends Sunday. If Kubiak steps down to create a fifth vacancy, one candidate may well be Miami Dolphins defensive coordinator Vance Joseph, according to the NFL Network’s Ian Rapoport.

And the name Shanahan may surface, too, with Kyle Shanahan, Mike’s son and currently offensive coordinator for the Atlanta Falcons. Atlanta is ranked second for total offense in the NFL through the first 15 games of this season.