He is considered "day to day" as the Bucs prepare to face the Green Bay Packers in the NFC Championship Game on Sunday, Tom Brady's 14th conference title game.
NFL Network was the first to report Brown's status.
Against the New Orleans Saints this past Sunday, Brown tweaked his knee and played only 27 snaps, including two in the third quarter and one early in the fourth quarter. He finished with one catch for 10 yards.
Since joining the Bucs in Week 9, Brown's role in the offense has grown significantly, helping a receiving corps that has been plagued by injuries much of the year.
Brown led the Bucs with 33 targets and four touchdowns in the final five weeks of the regular season and caught a 36-yard touchdown pass from Brady in the Bucs' 31-23 wild-card round victory at Washington.