Ryan Mallett shaken up, Tim Tebow enters game

AP

Patriots second-string quarterback Ryan Mallett departed Friday’s preseason opener at Philadelphia after being hit in the chest on a pass rush late in the second quarter.

Mallett’s specific injury is unknown.

Tim Tebow, the Pats’ third-string quarterback, replaced Mallett. His first two passes fell incomplete. One was a little short, with the other a little too long for his intended receiver. He was sacked on the next play, a third down, and the Patriots were forced to punt.

On the Patriots’ final series of the first half, Tebow threw two passes. One was deflected and landed incomplete, while the other was a dump-off to running back Leon Washington that gained 15 yards to end the half.

UPDATE 10:19 p.m. ET: Mallett suffered a head injury, the club said.