"My future? It's here at Chelsea", he said.
But, while Chelsea remain in control of the race to qualify for the Champions League, this was a far from convincing performance.
Sarri added: "You know very well that Willian is a very important player for us, as I said yesterday in the news conference".
"I need the player there, it depends on the club's decision, I think".
"At the moment in the defensive phase we are doing very well and one of the reasons, in my opinion, is that Eden is playing in that position", Sarri said. "I can not do anything more". We stopped [playing] for 25 minutes.
After failing to score in their last two home league matches - a 1-0 defeat to Leicester City and 0-0 draw with Southampton either side of Christmas - it took the Blues just nine minutes to edge in front here.
Veteran Kuchar fires back-to-back 63s to lead Sony Open
He was battling me, took the lead.it was nice to have that pressure, to have come through and to make some birdies coming in". Lahiri bogeyed the 460-yard par-4 sixth, getting on the green in 2 and three putting, moving him to one-over for the round.
The 30-year-old scored the victor against Newcastle following Pedro's first half goal.
Chelsea dominated possession in the first half-hour, but they switched off at the back as Newcastle nearly snatched an equaliser.
It was a warning that Sarri's men failed to heed and in the 40th minute Newcastle were level.
Hazard has now scored just four times in his last 17 games, suggesting he is much more effective in his natural role on the flanks.
The atmosphere was on the verge of turning even more toxic until Willian came to the rescue in the 57th minute.
The Brazil worldwide curled home a stunning victor to claim three points for Maurizio Sarri's side against Newcastle on Saturday.