Newcastle have now lost 10 in a row away to the division's established top six, but they put up a good fight in West London, levelling up through Ciaran Clark after Pedro opened the scoring, only for Willian to win the match for Chelsea.
On his decisive goal and the win over Newcastle, he added: 'I think it's always hard in the Premier League.
The Blues boss said: "After the goal I think we thought "now it's easy", but it wasn't". "I found the space and I put the ball exactly where I wanted to put it".
Barcelona are interested in signing the Brazilian in this January transfer window.
"Stop, stop, stop. I don't know anything about the Willian contract, but I don't know what to answer", Sarri said during his post-game news conference.
Thursday's National Basketball Association roundup: Heat shooting sinks Celtics
Yeah, not a great look for a player whose undesirable attitude often has coincided with underwhelming play in his junior season. The Boston Celtics have hit the midway point of the season and are now 25-16, good for fifth in the Eastern Conference.
Tuesday's 1-0 defeat against Tottenham in the League Cup semi-final first leg was the latest display of attacking impotence from misfiring Chelsea, who had failed to score in their last two home league games.
"We slept for 20, 25 minutes, so at the end of the first half we were in trouble". With Eden as a striker we need wingers so we need Pedro and Hudson-Odoi. "For us, he's fundamental".
Chelsea will be taking a trip to the Emirates in the next Premier League fixture as they look to extend the gap between themselves and the Gunner who are in fifth.
"I am really very happy with the result", Sarri said.
"We conceded a goal we could avoid but after that we were fighting for every ball; these players care you could see that", Benitez told the BBC.
The 30-year-old showed his value to Chelsea by scoring his side's victor against Newcastle to give Blues a six-point cushion over fifth-placed Arsenal in the race for Champions League qualification.
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