The Detroit Lions interviewed former Tennessee Titans coach Mike Munchak for their head-coaching vacancy.

Munchak was fired after a 7-9 season when he refused to make changes to his coaching staff.

He went 22-26 in three seasons.

"I can’t fire someone when I don’t believe they should be fired," Munchak told The Tennessean on Sunday. "Firing someone is awful. Too many people were going to be affected.I didn’t do anything to look like I was a great, loyal guy who went above and beyond the call of duty by not firing coaches. I did what you should do and what I thought was right. For me to maintain a job and a lot of guys lose jobs on a plan I didn’t think was right, I couldn’t do that."

Munchak is also a candidate for the Penn state job.

He's the third coach to interview for the Lions job, following Baltimore Ravens offensive coordinator Jim Caldwell and former Houston Texans head coach Gary Kubiak.

Ken Whisenhunt has been called the frontrunner for the job, which became open when the Lions fired Jim Schwartz.

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Aaron Wilson covers the Ravens for The Baltimore Sun.