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The Rangers boss felt two key decisions had gone against his side before it was later revealed that Clancy had received abusive emails.
Celtic moved within touching distance of the Scottish Premiership title as Kyogo Furuhashi's double inspired a dramatic 3-2 win against Rangers in Saturday's Old Firm derby.
Celtic look destined to retain the Scottish Premiership title after crushing Rangers' hopes with a thrilling derby victory.
Celtic are now unbeaten in six against their Glasgow rivals after a pulsating encounter at Parkhead.
Celtic moved within touching distance of the Scottish Premiership title as Kyogo Furuhashi's double inspired a dramatic 3-2 win against Rangers in Saturday's Old Firm derby.