Oakland Raiders running back Latavius Murray practiced Thursday for the first time since suffering a concussion and is optimistic about his chances of playing against the Vikings.

Four days after being forced out of a game in Pittsburgh following a powerful helmet-to-facemask hit by Steelers safety Mike Mitchell, Murray took part in position drills and showed no lingering effects while taking reps with Oakland's first-team offense during the 30-minute window for watching practice open to reporters.

"I feel good," Murray said. "I can't make the call on what their plans are, but I know I feel good and I've been progressing great through the week."

It was the second concussion in less than a year for Murray, who leads the AFC and is sixth overall with 630 rushing yards. He missed one game in 2014 after getting injured on Nov. 20 against Kansas City.

Rookie wide receiver Amari Cooper also practiced without limitations after sitting out Wednesday with a quadriceps injury in a precautionary move.

Bryant tirade

Dez Bryant's long-running feud with the media boiled over Thursday with a profanity-laced tirade in the Dallas Cowboys locker room.

Bryant's anger was directed at reporters for what he considers to be unfair treatment of him and the team and was so loud at one point that tight end Jason Witten, who was conducting interviews, excused himself to break away and try to calm the situation. Bryant then began yelling at Rich Dalrymple, the Cowboys senior vice president of public relations, saying if he did his job none of this would happen and if he didn't do his job he would take to Twitter to get his side out.

Coach Jason Garrett then walked in and he and Bryant went outside the locker room to talk. Bryant came back several minutes later with a smile on his face and turned his music up as loud as he could.

Etc.

• Chicago Bears wide receiver Alshon Jeffery, who has three consecutive 100-yard games, missed practice Thursday with what coach John Fox called a tweaked groin.

• Bears defensive tackle Ego Ferguson, who has been on injured reserve since last month, became the second Chicago player in three days to be suspended four games for violating the NFL's policy on performance-enhancing substances.

• Will Beatty's 2015 season is over, and so might his New York Giants career. The veteran tackle who spent the first half of the season on the physically unable to perform list recovering from a torn pectoral muscle was not activated by Thursday's deadline because of a new injury to his rotator cuff. Coach Tom Coughlin said that unrelated right shoulder injury will require surgery.