Discontent erupted among Rangers supporters after their squad's frustrating stalemate against Falkirk, leading to an incident where their team bus got prevented from moving from angry supporters.
The Japanese forward nodded in a stoppage-time decisive goal to earn hosts the Bhoys their three-two triumph against the visitors, delivering new manager Jens Berthel Askou their first defeat at the helm.
Visiting team had led thanks to a Australian striker brace, but Benjamin Nygren leveled the scores before the winger's match-winning diving header clinched the comeback for the Glasgow side.
This stoppage-time goal prevented the champions from an fixture break behind with 5 points.
Kelechi Iheanacho initially opened the scoring via the penalty in the twenty-eighth minute, but Stamatelopoulos swiftly flipped the on its head by scoring two goals around the interval.
These goals had the Lanarkshire side on track for a first win in Celtic Park in a decade.
However, the team's dedication to playing out from their own back – previously positive aspect of early-season form – turned costly when shot-stopper Calum Ward passed possession straight towards the opponent only 8 metres out the net.
This gift allowed the attacker to easily tap in the equaliser, paving way stage for tense finale.
The recent signing then produced a first significant contribution for Celtic only three moments into stoppage time, delivering over a low cross that the forward converted via a close-range header.
This crucial goal ended the opposition's impressive undefeated run, a run had their longest longest top-flight sequence since they lifted the nineteen fifty-two domestic cup final.
In another match, Jesper Karlsson netted a brace while Aberdeen secured their much-needed first league triumph of this season, routing opponents the Dee 4-0.
The result moves the manager's side closer into striking range to the sides above them in league table.
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