Martin O’Neill has agreed a deal to become the permanent manager of Celtic, STV Sport understands. Celtic’s largest shareholder, Dermot Desmond, held talks with O’Neill and Robbie Keane over the vacant manager role this week. It comes after O’Neill sealed a nail-biting league title on the final day of the season and a Scottish Cup win whilst acting as interim manager. The 74-year-old has agreed a one-year deal at the club with the option of another year.