The Blues record £71million man refused to be replaced with Willy Caballero minutes before his side went on to lose a penalty shootout against Manchester City.
Kepa, who sent Sarri into meltdown on the sidelines after ignoring his manager's instructions, later insisted the remarkable bust-up was a misunderstanding.
But how fair an assessment is that from the Spanish stopper? Here, SunSport takes you through a blow-by-blow account of how the farce truly unfolded…
After 118 minutes of football, Kepa was seen struggling with cramp and appeared to signal to the bench that he needed treatment after saving a shot from Sergio Aguero.
The Chelsea keeper had already complained of an issue with cramp in the preceding minutes and went to ground the second time before stretching out his legs to relieve the pain.
Alan Smith said on commentary: "I don't know if he's going to be alright this time, it's the same injury complaint that he's got."
Sarri's attempted Substitution
On the touchline, Sarri turns to penalty specialist Caballero who gets ready to come on while his manager can be seen motioning to Kepa that he will be substituted.
Cabellero was in goal for the final three years previously – for Manchester City when they beat Liverpool in a shootout – and saved THREE Reds penalties.
With just 40 seconds of extra time remaining, Kepa shouts 'no' at the Chelsea bench and wags his finger at his manager before throwing his arms in the air in anger.
Sarri appears initially unaware of his keeper's protests and retreats to his seat on the bench to take notes while Caballero stands bemused on the touchline.
20 seconds later, captain David Luiz gets involved and puts his arm around Kepa and seemingly explains that he's been subbed off behind the disguise of his hand.
To which point, Kepa shakes his head and gives a thumbs up to the bench before turning his gaze away from the Blues' staff.
Assistant manager Gianfranco Zola begins shouting at Kepa while Sarri can be seen sitting behind him, frantically gesturing for his goalkeeper to leave the field.
While Cabellero is left adjusting his gloves, two officials hold the boards ready to put through the substitution but neither EFL representative raises their signal.
Jon Moss then approaches Kepa and Luiz again for clarification and the Spaniard convinces both men that he will be staying on and the referee runs over to the touchline to relay the message.
The Chelsea boss, standing next to fourth official Paul Tierney, then explodes in fury after he was informed that his goalkeeper had undermined his instructions.
Sarri ignores an absent-minded Caballero to have a hurried and confused discussion with his coaches before re-approaching the pitch to speak to referee John Moss.
After a short exchange, the official signals to the stadium that the proposed substitution will not take place and crowd show their frustration
A furious Sarri then failed to contain his emotions on the touchline as he rips open his Chelsea-branded jacket and throws his notepad on the ground.
The under-fire Italian then stormed down the tunnel before changing his mind after passing a handful of staff and security in the walkway.
Sarri returns to the bench to vent to his assistant Zola while jabbing his finger back at the pitch. The clock shows 31:34, the madness unfolding in just over two minutes.
Sarri vs Kepa
After the match finished and went to penalties, Kepa sensationally WINKED at the camera just moments after his extraordinary on-field bust-up with his own manager.
There was then an angry exchange at the touchline and Antonio Rudiger is forced to intervene to stop Sarri confronting his goalkeeper after he had walked away.
Arrizabalaga remained in goal for the penalties and blundered Sergio Aguero's spot-kick – allowing it to slip under his arm and Chelsea lost the shoot-out.
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