Kelechi Iheanacho rescued Celtic with a late penalty on his debut for the club to guide them to a 2-1 win against Kilmarnock at Rugby Park.
Celtic supporters staged a protest against the board, not entering the stadium until the 12th minute, and their frustrations looked as if they were about to be compounded when David Watson's header cancelled out Daizen Maeda's 60th-minute opener.
But a late VAR check, after James Forrest's effort ricocheted off the hand of Lewis Mayo, offered new signing Iheanacho the perfect opportunity to endear himself to the fanbase.
The substitute stepped up with confidence to fire his side to the top of the Scottish Premiership table with virtually the last kick of the game, denying Kilmarnock a fifth draw in a row to spoil their unbeaten start.
While Iheanac