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The Philadelphia Eagles returned a defensive lineman to the lineup this past week in rookie Jordan Davis, who played Sunday in the Eagles' win over the Tennessee Titans after a short stint on injured reserve, but Philly has now lost another defensive lineman to IR. On Tuesday, the team placed defensive end Robert Quinn on injured reserve with a knee injury. 

According to NFL Media, Quinn underwent a knee scope this week, and the findings led the team to shut him down for at least the next four games. Quinn reportedly twisted his knee in practice last week, but Tom Pelissero reports there's optimism he will return for the playoff push. 

The Eagles sent the Chicago Bears a fourth-round pick for Quinn shortly before last month's NFL trade deadline. A fourth-rounder was a pretty decent price to pay for a 32-year-old, but the Bears reportedly agreed to pay $7.1 million of Quinn's remaining base salary in 2022. 

Quinn has not played more than 27 percent of defensive snaps in any of his five games played for the Eagles, and has recorded two combined tackles and two QB hits. While Quinn is headed to IR, the Eagles activated defensive end Janarius Robinson to the active roster to replace him.