"I'll say it again" - Kris Boyd makes Rangers v Celtic prediction in stern Old Firm warning Football FanCastRangers vs Celtic: Danny Röhl and Martin O'Neill's 'War of Words' ahead of Sunday's Old Firm - live on Sky Sports Sky SportsRangers v Celtic: Barry Ferguson 'confident' of Old Firm victory BBCSPFL on TV SPFLRangers vs Celtic score predictions as SunSport writers give their big verdicts ahead of seismic Old Firm clash at Ibrox The Scottish Sun