PITTSBURGH (AP) – The Pittsburgh Steelers will have to pursue perfection without outside linebacker Bud Dupree. Dupree is lost for the season after injuring his right knee in a victory over Baltimore that pushed the Steelers to 11-0. Rookie Alex Highsmith will get the first shot at replacing Dupree, whose eight sacks rank second on the team. This isn’t the first time this year the Steelers have lost a starting linebacker. Devin Bush went down in October with a knee injury. Coach Mike Tomlin says Highsmith is capable of taking over Dupree’s workload. Pittsburgh hosts Washington next week.