Three key issues Celtic and O'Neill must tackle

Martin O'Neill has plenty in his in-tray as he begins his second spell as Celtic's permanent manager [SNS]More than five months since the sacking of Wilfried Nancy, Celtic fans finally have confirmation of their club's new manager.It is the man who picked up the pieces not once but twice last season to guide the team to the Scottish Premiership title and the Scottish Cup.Martin O'Neill cemented his status as a legendary figure at Parkhead by ending a tumultuous campaign with a league and cup dou