Ken Whisenhunt has accepted an offer to become the next coach of the Tennessee Titans, according to league sources. Whisenhunt was completing his duties Monday as the San Diego Chargers' offensive coordinator after the team was eliminated Sunday in the AFC divisional round by the Denver Broncos. The Detroit Lions had planned to send their team plane to San Diego in an effort to further evaluate Whisenhun, but sources say Whisenhunt asked them to put those plans on hold until he was finished with his season-ending business with the Chargers. Once he was finished, Whisenhunt strengthened his bond with the Titans as talks moved toward a potential deal. Earlier Monday, Titans CEO Tommy Smith brought Bengals defensive coordinator Mike Zimmer to Houston for a second interview. Whisenhunt has previous head coaching experience, having gone 45-51 during a six-year stint with the Arizona Cardinals that saw the team make its only appearance in a Super Bowl. With Whisenhunt out of the mix, the Lions are focusing more closely on Jim Caldwell as a leading candidate for their vacancy. The Lions have kept open communications with the Baltimore Ravens offensive coordinator and his representatives. Former Colts head coach Tony Dungy spoke with Lions vice chairman Bill Ford Jr. earlier Monday to reaffirm strong attributes he believed Caldwell would bring to the Lions. Caldwell coached under Dungy while with the Bucs and Colts before succeeding him in Indy.