Tom Brady walked off the field under his own power. Several teammates didn't think he was hurt badly when he grabbed his left knee after being knocked down.
Yet the possibility that the New England Patriots might lose their star quarterback caused a scare at the team's joint practice with the Tampa Bay Buccaneers on Wednesday.
A person with knowledge of the injury said an MRI was negative and Brady was day-to-day with a left knee sprain. Asked if Brady might play Friday night in an exhibition game against the Buccaneers, the person said he didn't know.
The person spoke on condition of anonymity because the Patriots didn't make an announcement.
The two-time league MVP had a season-ending injury to the same knee in the 2008 opener.
Brady was injured midway through practice Wednesday when left tackle Nate Solder was pushed into him by Tampa Bay defensive end Adrian Clayborn. Brady, entering his 14th NFL season, fell, rocked backward on the ground and held his left knee.
He went to the sideline then returned for a few more plays before talking with coach Bill Belichick and leaving the field toward the team's indoor practice facility next to it.
Around the league
Redskins • Robert Griffin III, working his way back from reconstructive knee surgery, participated in 11-on-11 play for the first time in training camp, and completed 7 of 10 passes with an interception.
Broncos • Linebacker Von Miller, already facing a suspension for violating the NFL's drug policy, was arrested in the Denver suburb of Centennial on Sunday and then released, after he failed to show up in court on misdemeanor traffic violations.
Rams • Outside linebacker Jo-Lonn Dunbar, who had 115 tackles, 41/2 sacks, two interceptions and two forced fumbles last season, has been suspended without pay for the first four games of the season for violating the NFL's substance-abuse policy.
Bills • Kevin Kolb will start at quarterback for Buffalo in their preseason game Friday night against the Minnesota Vikings. Kolb is competing with rookie EJ Manuel for the starting quarterback job.
Detroit at Cleveland, 5:30 p.m.
Atlanta at Baltimore, 5:30 p.m.
Carolina at Philadelphia, 5:30 p.m.
San Diego at Chicago, 6 p.m., ESPN
Minnesota at Buffalo, 5 p.m.
Oakland at New Orleans, 6 p.m.
San Francisco at Kansas City, 6 p.m.
Tampa Bay at New England, 6 p.m.
Dallas at Arizona, 2:30 p.m.
Tennessee at Cincinnati, 5 p.m.
Jacksonville at N.Y. Jets, 5:30 p.m.
Green Bay at St. Louis, 6 p.m.
Miami at Houston, 6 p.m.
Denver at Seattle, 8 p.m.
Indianapolis at N.Y. Giants, 5 p.m.
Pittsburgh at Washington, 6 p.m.