With league leaders Hearts cruising to a comfortable 3-0 victory over Falkirk at Tynecastle, the pressure was entirely on Celtic to keep pace. For the vast majority of the evening, it looked as though the defending champions were going to hand the initiative to their rivals, which would have required them to chase a heavy goal-difference swing on the final day.
Motherwell opened the scoring in the 17th minute when Elliot Watt unleashed a spectacular strike from outside the box, leaving Celtic goalkeeper Viljami Sinisalo with absolutely no chance. Celtic fought their way back into the contest and found a vital equalizer just before the halftime break, courtesy of a sharp, left-footed finish from Daizen Maeda in the 41st minute.
The momentum shifted in Celtic's favor early in the second half. In the 58th minute, Benjamin Nygren struck a powerful effort into the back of the net to put the visitors 2-1 ahead. The reigning champions looked to be managing the game well until a late twist in the 85th minute, when Motherwell substitute Liam Gordon turned the ball home from close range to make it 2-2, sparking wild celebration among the home support.
Had the match ended in a draw, Celtic would have been left needing to defeat Hearts by a margin of at least three goals on Saturday. Instead, deep into seven minutes of signaled injury time, drama struck. A long throw-in launched into the Motherwell penalty area saw Auston Trusty challenge Sam Nicholson. Following a lengthy VAR review, referee John Beaton was instructed to check the pitchside monitor and ultimately ruled that the ball had struck Nicholson's raised hand, awarding Celtic a penalty.
Substitute Kelechi Iheanacho stepped up under immense pressure in the 100th minute, calmly rolling his left-footed penalty past Calum Ward to send the travelling fans into absolute euphoria.
The victory keeps Celtic just one point behind Hearts heading into Saturday's final-day blockbuster at Celtic Park. The equation is now simple for Martin O'Neill's side: a home victory on the final day will secure the Premiership title, while Hearts need only a draw to claim their first league championship in 66 years.