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With the Chargers’ season over, the focus turns to whether San Diego offensive coordinator Ken Whisenhunt returns to the NFL head-coaching ranks.

Whisenhunt, the Cardinals’ head coach from 2007 through 2012, has interviewed with Detroit, Cleveland and Tennessee for their head-coaching vacancies. He’s been linked to the Lions’ job since December, but the Titans are also “very interested” in Whisenhunt, Jim Wyatt of the Nashville Tennessean reported Sunday night.

The Titans fired coach Mike Munchak eight days ago. Whisenhunt is one of three candidates who have interviewed with the Titans.

Whisenhunt, 51, led Arizona to a 49-53 mark in his tenure. The Cardinals twice won the NFC West and advanced to Super Bowl XLIII in 2008.