New England Patriots quarterback Tom Brady throws during an NFL football training camp in Foxborough, Mass., Thursday.

New England Patriots quarterback Tom Brady wipes the sweat from his head during an NFL football training camp in Foxborough, Mass., Thursday, July 30, 2015. (AP Photo/Charles Krupa)

New England Patriots quarterback Tom Brady, right, gets set to run a drill with his back-up Jimmy Garoppolo during an NFL football training camp in Foxborough, Mass., Thursday, July 30, 2015. (AP Photo/Charles Krupa)

A football rests tangled in the netting of a practice field as the New England Patriots participate in their first NFL football training camp of the season in Foxborough, Mass., Thursday, July 30, 2015. (AP Photo/Charles Krupa)

New England Patriots head coach Bill Belichick listens to a question as he meets with the media before the team's first practice at an NFL football training camp Thursday, July 30, 2015, in Foxborough, Mass. (AP Photo/Charles Krupa)

New England Patriots quarterback Tom Brady clutches the football during an NFL training camp in Foxborough, Mass., Thursday, July 30, 2015. (AP Photo/Charles Krupa)

A banner towed by an airplane over the New England Patriots' practice field reads "Cheaters Look Up!" as it passes the lighting rack above Gillette Stadium during an NFL football training camp in Foxborough, Mass., Thursday, July 30, 2015. (AP Photo/Charles Krupa)

New England Patriots quarterback Tom Brady scrambles as he is hit by blocking arms during an NFL football training camp in Foxborough, Mass., Thursday, July 30, 2015. (AP Photo/Charles Krupa)

New England Patriots fans hold signs supporting quarterback Tom Brady during an NFL football training camp in Foxborough, Mass., Thursday, July 30, 2015. (AP Photo/Charles Krupa)