Carson Wentz left Sunday's game against the Los Angeles Rams with an injury to what looked like one of his legs.
AP sources say doctors believe Wentz has a torn ACL. He will have an MRI to confirm, there won't be an official annoucement until Monday.
Wentz is in the Middle of an MVP caliber season. He ranks first in the NFL with 33 touchdowns and has thrown for over three thousand yards in just his second season.
The Eagles won the game 43 to 35 over the Rams, clinching the NFC East division. Back up Nick Foles took over the signal calling duties.