Arrizabalaga was left on the field while Sarri stormed down the touchline and was clearly furious at the Spaniard.
Chelsea lost on penalties and while Kepa saved one spot-kick, he was guilty of allowing Sergio Aguero's effort to sneak beneath him when he will have felt he could have saved it.
The club fined the 24-year-old a week’s wages, and Sarri decided he had to be dropped for last night’s London derby.
Despite benching the £72million summer signing, Sarri insists that his long-term plans for Kepa have not changed.
Maurizio Sarri insisted that he does not fear for his job (Image: GETTY)
Chelsea: Sarri was ‘pathetic’ in Kepa altercation says Jordan
“Of course [he is still number one],” the Blues boss said.
“I think it was the right decision, Kepa made a big mistake, he paid with the club, and then he had to pay with the team.
“But now I have to think we have to stop, Kepa from tomorrow will be with us.
“He is back in the team for the weekend, I don't know in the next match if he will be on the pitch or not, but one of the next two he will [start].
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Maurizio Sarri was enraged on Sunday (Image: GETTY)
"When you are young I think you can make mistakes, and the most important thing is that you need to understand very well after every mistake.
“For me, now the best thing is to close it."
Chelsea’s win over Tottenham has helped to ease the pressure on Sarri, who had previously been a short bet with the bookies to face the sack.
However, the Italian insisted he never feared for his job.