The debutant Kelechi Iheanacho scored a last-gasp penalty as mutinous Celtic fans were left celebrating a 2-1 victory over Kilmarnock that moved them back to the top of the Premiership. After a summer in which the club were widely deemed to have failed to adequately bolster their squad in the summer before crashing out of the Champions League at the hands of Kairat Almaty, angry supporters held a crisis meeting last week and decided to boycott the opening 12 minutes of the Rugby Park fixture.