Trey Flowers, who leads the New England Patriots with six sacks and 19 quarterback hits, will not play in Sunday's road game against the Buffalo Bills because of an injury to his ribs, the team announced Saturday night.

Flowers had been limited all week in practice and was questionable on Friday's injury report after injuring his ribs late in the third quarter of last Sunday's win over the Dolphins. But when he didn't travel with the team to Western New York, he was officially downgraded to out by the club.

The 2015 fourth-round draft choice out of Arkansas has been an ironman for the Patriots, playing 88.2 percent of the defensive snaps in the team's 9-2 start. The Patriots have been thin at defensive end all season, which has forced Flowers, in part, to play such a large role.