"I don't know", the Italian said when asked about the failure to create chances.
Hazard missed three consecutive games last month after suffering a back injury in the 2-2 draw with Manchester United, who were accused of targeting the Belgium worldwide with fouls.
Everton's winless run in the top flight at Chelsea stretches to 24, but Marco Silva's men have now been beaten just once in six league outings.
Frustrated by Chelsea's failure to turn possession into goals, Sarri said: "Usually yes we are sharp enough, but not in the last three matches".
"At the moment, we are doing well and that's why I am doing well".
With David Luiz, Antonio Rudiger, Marcos Alonso and Alvaro Morata rested and left in London, it was a surprise to some that Hazard travelled.
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He added: "It was the plan to miss the Salonika game. But then I thought we played very well, especially in the second half".
"We played very well for 65 minutes".
Hazard has been continuously linked with a switch to Real Madrid and it is understood a deal to go the Bernabeu in the summer collapsed.
The win over Palace saw Sarri equal Frank Clark's 1994 record of remaining unbeaten in his first 11 Premier League games; avoid defeat against Everton and Sarri will have the record to himself.
While Chelsea did lose to Manchester City in the Community Shield back in August but that match can not be counted as a competitive game given as many as six substitutes were allowed for that game. Chelsea should be a Champions League club.
Sarri's side recovered from a poor first half performance and laid siege to the Everton goal after the break, but found Pickford unbeatable as the England keeper made a series of fine saves.