The Eagles hung on for a 43-35 win over the Rams.
Elliott kicked a 41-yard field goal to pull the Eagles to 35-34.
Fox Sports' Erin Andrews said that it is a left knee injury, and also that she saw the Eagles' support staff in the locker room with Wentz all walk out shaking their heads.
This was the eighth time in the Super Bowl era that quarterbacks taken No. 1 and No. 2 overall in the same draft squared off. Goff was the first pick overall in 2016, followed by Wentz.
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Wentz was hit hard as he scrambled into the end zone on a play that was called back because of holding.
Carson Wentz threw for four touchdowns before leaving the game in the fourth quarter with a knee injury, finishing with 291 yards, four touchdowns and one interception. He remained in the game, and threw a touchdown pass to Eagles wide receiver Alshon Jeffrey.
As it turns out, the injury he was brought to the locker room for was a knee injury, and Wentz was nearly immediately ruled out for the rest of the game. Adam Schefter, one of the most trusted sources in the National Football League, reported during the game there's concern from the Eagles that Wentz might have a torn ACL.
The Eagles are NFC East champs, they still have a great chance at home field advantage and yet the sky is falling.