Embattled Browns coach Eric Mangini left the team’s training facility late yesterday afternoon after presumably meeting with new team president Mike Holmgren. Mangini did not stop to speak with reporters outside.

Mike Shanahan was introduced as the Redskins’ new coach, one day after signing his five-year, $35 million contract. “I’ve got very high standards, just like everybody in this organization,’’ said Shanahan. “I can’t tell you how long it’s going to take. But I can guarantee you: We’ll get better every day.’’ . . . Vikings receiver Percy Harvin was named the league’s Offensive Rookie of the Year, receiving 41 of 50 votes. Ravens offensive tackle Michael Oher was second with six votes . . . Former Patriots receiver Terry Glenn has been charged with auto theft in what his attorney says is a mix-up over a car rental. Attorney Luis Vera said Glenn had rented a sport utility vehicle from National Car Rental several weeks ago while his Bentley was in the shop. He said Glenn was on his way to return the SUV when police stopped and arrested him, telling him National had reported the vehicle stolen . . . Loleini Tonga, the fiancee of late Bengals receiver Chris Henry, will not be charged in connection with his death last month . . . The league has adjusted instant replay rules to allow reviews of time remaining for the last play of each half or an overtime period in the playoffs . . . Vikings defensive coordinator Leslie Frazier is slated to talk with the Bills today about their head coaching job.