Capitals defenseman Mike Green is out "at least a couple of weeks, maybe longer" with a head injury, general manager George McPhee said Monday. Green took an apparent elbow to the head from the Rangers' Derek Stepan on Friday. He left the game and has not played since. Earlier in February, Green took a puck to the head -- a Brooks Orpik shot to the ear -- in a win over Pittsburgh. The Capitals acquired defenseman Dennis Wideman from the Florida Panthers for prospect Jake Hauswirth and a third-round 2011 pick before the trade deadline. Read more: http://sports.espn.go.com/nhl/news/story?id=6168752