"Titans Defensive Coordinator Dean Pees was experiencing a medical issue during the game," the team said in a statement. "He was tended to by medical personnel and was transported to a local hospital for further observation."
Titans head coach Mike Vrabel gave an update on Pees following the team's blowout loss to Indianapolis.
"Dean's doing OK," Vrabel said. "... They're going to keep him overnight for some tests but everything that I've heard as of now has been very positive that he should make a full recovery and be fine."
Pees, 69, joined the Titans coaching staff last offseason after working as the Baltimore Ravens' defensive coordinator from 2012-17. Pees spent eight seasons in Baltimore, where he worked as their linebackers coach before moving up to defensive coordinator. He won a Super Bowl title with the team in 2012.
Prior to joining the Ravens, he established himself as one of the top defensive coaching minds in the game as the New England Patriots' coordinator. He was linebackers coach (2004-2005) and defensive coordinator (2006-2009) under Bill Belichick when Vrabel was starring for the Patriots last decade. He also won a Super Bowl with the Patriots.
Pees initially planned to retire last offseason after his Ravens defensive unit finished sixth in points allowed per game (18.9) and were in the top 10 in passing yards allowed per game (213.8). He then changed his mind and joined first-year coach Vrabel's staff in Tennessee.