Heimerdinger had a successful five-year run as the Titans offensive coordinator from 2000-04. A formal announcement will be made at a news conference Friday morning.
Heimerdinger takes over an offense that was one of the NFL's worst this season. The Titans are hoping he will jump-start what was a vanilla scoring attack headed by quarterback Vince Young, who threw nearly twice as many interceptions as touchdown passes this season.
Players and coaches say Heimerdinger could help improve an offense that finished 27th in passing in 2007 and was last in the league in touchdown passes and red-zone efficiency.
Guard Benji Olson, a 10-year veteran who was still mulling whether or not to retire, said Heimerdinger's first tenure in Tennessee was productive.
"Dinger was very good at exploiting things in the secondary and opening up the passing game," Olson said prior to the announcement.
Heimerdinger replaces Norm Chow, who was fired Tuesday even though Tennessee reached the playoffs for the first time since 2003.
Chow wasn't able to develop Young liked many in Tennessee had hoped. The Titans fared well in Chow's second season in 2006 when Young was the NFL's Offensive Rookie of the Year. But Young struggled last season, throwing nine touchdown passes and 17 interceptions.
Tennessee running backs coach Sherman Smith said Heimerdinger's return would be a welcome one.
"We know his strengths as a coach. He knows the offense and knows the coaches and can help us win," Smith said.
The past two seasons in Denver, Heimerdinger held the title of assistant head coach and worked with the offense.
He helped quarterback Jay Cutler, drafted behind Young in 2006, move into the starting role as a rookie and a full-time starter entering this season. Cutler ranked fifth in the AFC in passer rating in 2007, with an 88.1 rating, while throwing for 3,497 yards and 20 touchdowns.
Copyright 2007 by The Associated Press