The Carabao Cup final was a largely unentertaining affair but it really came to life in the final few minutes.
In the dying moments and with the game going into extra-time, Kepa went down with suspected cramp.
After being treated, Maurizio Sarri decided he had to be substituted.
But Kepa wasn't having any of it.
With Willy Caballero ready and waiting Kepa simply refused to go off.
A few minutes went by as Sarri tried to convince the Spanish goalkeeper to leave the field, but his efforts were to no avail.
In the end, Kepa stayed on the pitch. Sarri was left fuming.
If you haven't seen it, watch the incident below:
Manchester City would go on to win on penalties, with Raheem Sterling scoring the winning penalty.
Sarri was asked about his thoughts on the matter after the game, but he labelled it as a misunderstanding.
"It was a misunderstanding because, by radio, I understood there was a problem and we needed a change, and I realised the situation only when the doctor arrived to the bench," Sarri said.
"So it was a big misunderstanding because I understood that the goalkeeper had cramp and was unable to go to the penalties. But it was not cramp and so he was able to go to the penalties.
"The goalkeeper understood that I asked for a change for his physical problem, and he said: 'I haven't a physical problem' and so he was right, I think.
"I realised this after when the doctor arrived to the bench and, with the keeper with a little problem, I wanted Caballero to be ready."
Sarri then confirmed that Kepa will not receive any disciplinary action.
"No, I have to talk with him but only to clarify," he said. "Because now I have understood the situation."
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