At Wednesday' practice at New England Patriots camp, quarterback Tom Brady went down and grabbed his left knee after an incomplete pass in 11-on-11 drills in a joint practice with the Tampa Bay Buccaneers.
An MRI on Brady's knee was negative and he is considered day to day, a source with knowledge of the injury told Adam Schefter of ESPN.
A fan's video showed Bucs defensive lineman Adrian Clayborn push Patriots offensive lineman Nate Solder into Brady's leg just after he threw the ball. Brady immediately went down and grabbed his leg.
After practice, Clayborn told reporters he was bull-rushing Solder on the play during which Brady was injured, and that Solder fell back into Brady.
"You always have to stay away from the quarterback but if you have a guy on his heels, my instinct is to keep going," Clayborn said after the practice session.
Solder said he wasn't sure exactly what happened on the play.
"Anytime someone goes down we worry about it," Solder said. "So we'll see what happened. I don't know at this point. ... There were a few different things that happened, so I'll have to see it [on film]."