The forward has been unable to join the club's pre-season as he is on an extended break following his exploits with Belgium, who finished third at the recently concluded World Cup in Russian Federation.
Sarri, speaking at a news conference on Wednesday, described Hazard as "one of the top two or three European players".
Chelsea striker Olivier Giroud, meanwhile, wants to stay and fight for his place, despite interest from Atletico Madrid.
Chelsea have confirmed Gianfranco Zola is returning to the club as Maurizio Sarri's assistant. The Italian also spoke of his desire to hold face-to-face talks with Eden Hazard and Thibaut Courtois over their futures, with their contracts winding down. "I would love us to start well and we are all very excited to start this new adventure".
Asked specifically about club captain and Chelsea's longest-serving first-team player Gary Cahill, who was on Tuesday linked with a move, Sarri said: "With respect to Cahill, I think he can still give us a lot".
Sarri said he didn't know what to expect from his side in the clash with Perth.
"Antonio reached incredible results here and is an extraordinary manager", Sarri said, "All good things that Conte did must be left".
The new kit will be available for £90 and will be debuted by the players on Saturday, July 28 when they take on Inter MIlan.
Chelsea flew into Australia on Thursday night - just five days after Belgium's last World Cup match.
He said his primary aim was to enjoy the role without fear of the sack.