Carolina Panthers quarterback Cam Newton left Thursday's preseason game against the New England Patriots early due to a foot injury, NFL Network's Ian Rapoport reports. He will not return for the game, and it's unknown how severe the injury is or where it precisely is on his foot.

Before leaving the game, Newton hit 4-for-6 passes for 30 yards. Kyle Allen filled in. Will Grier and Taylor Heinicke will follow.

The Panthers sat Newton for two games at the end of the 2018 season. He had been dealing with a lingering shoulder issue for the majority of the year. Shortly into the offseason, the quarterback went under the knife to repair the surgery. Many presumed he'd be out for at least the entire preseason, but that prediction didn't age well.

Newton has not dealt with foot injuries in his NFL career, but he has had some ankle ailments. In college, he sprained his ankle, then did so again late into 2012. In 2014, the 2015 MVP suffered a ligament tear in the same ankle and underwent surgery the following offseason. Since then, he hasn't suffered any foot-area injuries.

SportsInjuryPredictor.com puts Newton at high risk of re-injury and gives him a 45% chance of injury in 2019, but it doesn't expect him to miss any games.

In 2018, Newton enjoyed his most efficient year as a pro. In Norv Turner's offense, he recorded a 67.9% completion rate while throwing for 3,394 yards and 24 touchdowns to 13 interceptions. His 94.2 quarterback rating was the second-best of his career. In addition, Newton ran for 488 yards and four touchdowns on 101 attempts.