The New England Patriots received a scare at practice on Wednesday when Tom Brady went down with an apparent knee injury. The quarterback was hit during a joint practice with the Tampa Bay Buccaneers, and grabbed his left knee afterward. Brady fell after he threw an incomplete pass and Buccaneers defensive lineman pushed Patriots offensive lineman Nate Solder into Brady’s lower body.

The severity of the injury is not known, but the veteran was forced to leave the field. Brady rejoined practice after missing one play. Eventually, he had to leave for good when he spoke with head coach Bill Belichick, offensive coordinator Josh McDaniels, and head trainer Jim Whalen.

Brady has remained injury-free for almost his entire career. His one severe injury came in 2008 when he tore his ACL in Week One.

If Brady misses any significant time, backup signal caller Ryan Mallet would take over the starting duties. Tim Tebow would likely move to No.2 on the depth chart.

New England's next preseason game is scheduled for Friday night against Tampa. They won their opener against the Philadelphia Eagles last week.

Below is video of Brady’s injury, via The Big Lead. He was able to walk off under his own power when he left for good.