Douglas, who led the team with 12 1/2 sacks last season, will have surgery Wednesday, agent Drew Rosenhaus said. The Eagles did not remove Douglas from the 53-man roster and would not give any details about the operation.
Coach Andy Reid had said Monday that Douglas would be out for the year if he needed surgery. Reid was not available Tuesday, the team's day off.
"There's a strong chance he's going to need surgery on that," Reid said at his weekly press briefing. "If he does, he'll be out for the year."
Douglas ruptured his left biceps as he fought off a blocker while chasing Bears running back Curtis Enis in the Eagles' 20-16 victory over Chicago on Sunday.
Rosenhaus held out hope that Douglas could return this season, but the Eagles (2-4) would have to keep him on the active roster. New England linebacker Ted Johnson had the same injury in the preseason and was not placed on injured reserve. The Patriots said he would be out four months.
"If that was up to Hugh, I'm certain he would want to come back and contribute," Rosenhaus said. "We do know he's a fast healer."
Douglas had just come back missing two weeks with a partially torn knee ligament after doctors expected him to miss six weeks. Losing him again is a huge blow to the Eagles' defense, which leads the NFL with 17 turnovers.
"It's very frustrating, because I only got to play about two games and then this happens," said Douglas, who does not want to play at less than full strength. "I'm not the biggest defensive lineman to begin with. To play at half my strength, that wouldn't be good."
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