The Philadelphia Eagles fear Carson Wentz could be lost for the season, though head coach Doug Pederson did not want to speculate on the injury amid reports the star quarterback suffered a torn anterior cruciate ligament.
Wentz was ruled out for the final quarter of Sunday's 43-35 win over the Los Angeles Rams after he was hit on his left knee diving into the end zone late in the third quarter.
Pederson would not comment on multiple reports speculating over an ACL injury, with Wentz set to undergo an MRI on Monday.
Wentz - who was 23 of 41 for 291 yards with four touchdown passes and an interception before exiting - scrambled from the two-yard line before diving into the end zone.
The 24-year-old was hit on his left knee by Rams linebacker Mark Barron. Wentz's apparent touchdown was then negated because of a holding penalty.
Wentz stayed in the game to throw a two-yard touchdown pass to Alshon Jeffery as the Eagles took a 31-28 lead. He then walked to the locker room with a towel around his neck.
The Eagles - crowned NFC East champions - declared him out to start the fourth quarter. The Rams scored to regain the lead on the ensuing possession and Nick Foles took over at quarterback trailing 35-31.