Chelsea, who are battling for a top-four finish, face a pivotal week in both the league and in Europe.
Sarri was reportedly on the brink of being sacked after Chelsea suffered humiliating Premier League defeats at Bournemouth and Manchester City and then crashed out of the FA Cup.
Blues boss Maurizio Sarri dropped Kepa for Chelsea's midweek 2-0 win over Tottenham as punishment for the Spaniard's refusal to be substituted during last weekend's League Cup final.
Sarri is yet to decide whether to recall Kepa for Sunday's London derby after dropping him for Wednesday's win over Tottenham.
David Luiz insists it was a misunderstanding, Kepa Arrizabalaga says he didn't intend to disobey but what next for Chelsea?
Chelsea defender believes that the Kepa incident was a misunderstanding and the players are on Sarri's side.
Sarri was visibly furious when Kepa refused to leave the field after needing treatment, but the Italian coach later claimed his anger was the result of a "misunderstanding".
Booed off at the final whistle, the beleaguered Blues manager felt Chelsea deserved better after the FA Cup holders started the fifth round clash on top.
A 6-0 thrashing at the hands of Manchester City on Sunday was Chelsea's heaviest defeat since 1991.
Sarri acknowledged on Friday a return to Champions League football next season is Chelsea's target.