The team on Thursday signed the veteran backup quarterback to a two-year extension worth $5.25 million, NFL Network Insider Ian Rapoport reported, per a source informed of the signing. The 34-year-old quarterback will get $2.75 million of the deal in 2017, Rapoport added.
Rapoport called the move a "priority" for Tennessee at this week's NFL Scouting Combine in Indianapolis.
Cassel saw action in four games last season, completing 30-of-51 passes for 284 yards with two touchdowns and a pair of picks. His role became pivotal after starter Marcus Mariota fractured his fibula in late December.
Cassel oversaw a 38-17 loss to Jacksonville in Week 16 before engineering a 24-17 win over Houston in the regular-season finale. He's hardly an inspiring option behind Mariota, but his familiarity with the offense is a plus. It's possible that Cassel will be needed to run the show for much of the offseason while the Titans wait on Mariota to heal.