Brady limited in practice again: I'm not 'a spring chicken anymore'

New England Patriots quarterback Tom Brady's calf injury has forced him to be limited in three of the last four practices.

At 42 years old, Brady acknowledged he can't overcome injuries the same way he used to.

"Football is a contact sport. I wouldn't say I'm a spring chicken anymore," Brady said with a smile Wednesday, according to ESPN's Mike Reiss. "I'm trying to just feel as great as I can and we'll see how it goes tomorrow. But I feel pretty good."

While there isn't any indication Brady will miss game time due to the ailment, New England added a third quarterback on Wednesday when it signed Cody Kessler.

Rookie Jarrett Stidham was previously the only other signal-caller on the roster.

Brady has been virtually flawless through the first three weeks of his 20th NFL campaign. He's thrown seven touchdowns to zero interceptions and is tied for fourth in the league in yards per attempt (8.6).

On Sunday, the 3-0 Patriots will travel to Buffalo to face the also undefeated Bills, who have beaten Brady only twice at home since he became New England's starter in 2001.