The New England Patriots are 4-0. Their latest win cam Sunday night against the Atlanta Falcons, 30-23. In that win, the Patriots might be losing a big part of their defense. 

Vince Wilfork left the Sunday night game in the first quarter. NFL sources confirmed to ESPN on Monday morning that WIlfork did tear his Achilles, and is most likely done for the season.

The Patriots owe a lot of their success to their defense, which will be missing a major piece with Wilfork out. They did seem to do okay against a struggling Atlanta team, but the offense is also lacking some major players in Danny Amendola, Rob Gronkowski and Shane Vereen.

The Patriots will look to improve to 5-0 next Sunday against the Cincinnati Bengals.