10 September, 2017
Haden missed a number of games over the past two years with various injuries, including a concussion, finger injury and a groin issue.
His absence against the Browns leaves Anthony Chickillo in line to make his eighth career start.
Dupree missed the first nine games of past year following a groin operation.
Haden had been under contract for $11.1 million this season, $11.2 million next season and $10.5 million in 2019, though he was not subject to waivers and was free to sign with another team beginning Wednesday after 4 p.m. ET.
Pittsburgh abandoned its outside linebacker rotation down the stretch of the 2016 campaign as Dupree and James Harrison dominated the share of snaps.
The Macon, Ga., native played all four of his collegiate seasons at Kentucky, racking up 74 tackles, 9.5 sacks, three forced fumbles and a defensive touchdown during his final season with the Wildcats.
Union president Steve Loomis said last weekend that members of the union would not hold the American flag during Sunday's game against the Steelers because Browns management had "allowed" a group of players to kneel during the anthem before a preseason game.