While the conventional wisdom at the start of the season was that only Liverpool could challenge Manchester City for the title, Chelsea have showed they are genuine contenders.
The former Napoli manager's footballing style at the Stamford Bridge has been highly praised and drawn enormous success in the last three months. However, since 2015/16, Zaha has been booked four times for diving in the Premier League, more than any other player.
Sarri also appeared to rule out a January loan move for Ruben Loftus-Cheek but insists the midfielder must improve if he is to claim a regular place in his Premier League side. Meanwhile, Crystal Palace were beaten by Championship side Middlesbrough in the same competition, their fifth consecutive game without a win.
However, Sarri's decision to bring Hazard on just after the hour mark with the game at 1-1 changed the clash.
Palace should welcome Wilfried Zaha back in to the side after he recovered from a minor shoulder problem that kept him out of the League Cup defeat to Middlesbrough.
Palace are now without a win in six league matches. 3-1 to Chelsea.
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Hazard and Mateo Kovacic were sent on for Willian and Ross Barkley and Hazard had an immediate impact.
The Blues will be looking to maintain their undefeated start to the season but will face a tough test against Crystal Palace who has seemingly turned a corner following their 2-2 draw against Arsenal last time out.
Derby manager Frank Lampard was pleased to receive a warm welcome from the Chelsea fans at Stamford Bridge. Any fears that Chelsea would struggle to import Sarri's style of football from Naples appear to have been unfounded: 15 games in, they are still unbeaten.
Mourinho actually needs a new striker, as both Romelu Lukaku and Marcus Rashford have not totally convinced this season with only five goals between them in 24 competitive games, but Moses could fit in.
As Sarrismo has Chelsea applying constant pressure on opposition defences, the Blues have nearly always managed to get at exhausted opponents as the game goes on - as shown with Barkley's 96th-minute equaliser against Manchester United.
The club is prepared to make Hazard the highest paid player in the its history but the 27-year-old is waiting for news from the La Liga giants before deciding on a new deal, according to the Telegraph UK.