"The workload of a Pro Bowl season looks to be taking its toll on Tom Brady.

The New England Patriots quarterback will not practice Thursday due to a left shoulder injury that reportedly required X-rays, a league source told ESPN NFL Insider Adam Schefter.

The injury is not considered severe enough to prevent him from playing Sunday against Buffalo, but it is causing Brady discomfort. Brady also missed practice on Wednesday, though the team said that the absence was for non-injury related reasons.

Brady looks to have suffered the injury when he scrambled and fell hard on the shoulder in the fourth quarter against the Miami Dolphins Saturday. After the victory, Brady dressed slowly at his locker and seemed to be cautious moving the joint.

One report, from Comcast SportsNet, indicated that Brady had X-rays after the game to check for a separation and was told he was "all set."

Brady is second in the league in passing yards behind Drew Brees, who broke Dan Marino's record for yards in a season. Brady will likely also pass the mark Sunday.

He's third in the league in passer rating, completion percentage and touchdowns behing Brees and Aaron Rodgers in what could be the greatest quarterback season in NFL history.

Still Brady was hit behind the line of scrimmage a season-high eight times Saturday. He's been hit 65 times this season. "