Robinson, the last of 255 players selected in the NFL's annual draft of college players in April, agreed in principal to the deal, agent Andrew Benedict said in an e-mail. Financial terms weren't disclosed.

Lions spokesman Matt Barnhart didn't immediately return a telephone message at his office seeking comment.

The 23-year-old cornerback from the University of Alabama waited a record 18 hours, 5 minutes to hear his name called during the draft's seven rounds, after the Oakland Raiders selected JaMarcus Russell with the first pick.