Former Mississippi State star DT Fletcher Cox has been a force for the Philadelphia Eagles this season.

For his efforts, he was named the NFC’s Defensive Player of the Month for September.

However, the 3-1 Eagles may be without their star on Sunday against the Washington Redskins.

According to Pro Football Talk, Cox is dealing with an ankle injury that he suffered in a loss to the Detroit Lions.

Cox has four sacks through four games in 2016 and has forced one fumble.