Johnson told the (Nashville) Tennessean he played with a partially torn meniscus after injuring himself early in the season.
"It's nothing major," Johnson said via text. "People don't know I been playing with it since week 3 of the season."
He ran for 1,077 yards and six touchdowns in 2013. The Titans' former first-round draft pick in 2008 is scheduled to make $8 million next season and has said he will not take a pay cut to remain with the team, prompting wide speculation he will be released and hit the free agent market this offseason.