The federal judge handling the NFL concussion case has denied preliminary approval of the $760 million settlement agreed to by the league and its former players.

U.S. District Judge Anita Brody of the Eastern District of Pennsylvania said in a short opinion issued Tuesday that she is not convinced that all of the former players who will qualify for settlement money due to various types of brain injuries sustained while they played for the National Football League will actually be able to collect from the fund.