Rangers legend Ally McCoist was surprised to see Uddingston's Alex Lowry not substituted on during his former side's 1-1 draw with Celtic.
Jota opened the scoring for Ange Postecoglou's team, who were looking to extend their lead in the Premiership's first place to nine points.
Fashion Sakala's effort after half-time ensured it remained at six, but with three games to go this league season, it's still Celtic in title race control.
Named as a substitute, attacking midfielder Lowry didn't get the chance to impress and make his fifth senior appearance for Rangers.
It surprised club-record goalscorer McCoist, who thought he might be one boss Giovanni van Bronckhorst turned to for inspiration.
The East Kilbride native said on Sky Sports commentary: "I really would have (got Lowry on).
"He's a young lad, give him an opportunity, give him 30 minutes. I would have thought about someone like that."
Lowry will hope to be involved this Thursday when Rangers host a massive Europa League semi-final second against Bundesliga side RB Leipzig.
He was involved in the away leg squad, which van Bronckhorst's side lost 1-0.
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