Justin Houston insists he's not done yet.
Houston signed with the Indianapolis Colts on a two-year deal Thursday after spending eight years as a pass-rusher for the Kansas City Chiefs.
Though he just turned 30 and has battled injuries in recent years, he's eager to prove he has more to give, telling team writer Andrew Walker that he has "plenty in the tank."
"I think some people don't believe that," he said. "So it's more so what I'm about to show the world than myself because I know what I'm capable of."
Houston posted nine sacks in 12 contests this past season and came within a game of reaching the Super Bowl with Kansas City.
The Chiefs defeated the Colts on their way to the conference championship, but Houston liked what he saw from the divisional-round contestants.
"I think it's a great fit for me," he said. "And just seeing what they have from the previous year, and then playing against them last year, I know they've got a great team and they're heading in the right direction. So I would love to be a part of it."