Hazard has been constantly linked with a move to Real Madrid and has admitted he wants to play for Los Blancos one day.
The Belgian has shone for Chelsea this season having scored 13 Premier League goals as well as having ten assists.
The Blues are currently fourth in the Premier League table and travel to Bournemouth tonight (7.45pm).
Hazard is expected to play at the Vitality despite rumours linking him with a move away from Chelsea.
It’s unlikely a deal will take place before the January transfer window closes tomorrow (11pm).
But with a summer move looking increasingly likely, Sarri has admitted Hazard has to move on if it’s what he really wants.
“Eden is 28. If he wants to go, I think he has to go,” Sarri said.
“Of course, I hope the opposite, I hope he wants to stay here.
“He has the potential to be the best player in Europe at the moment.”
Transfer expert Guillem Balague believes Hazard is just waiting for Real Madrid to open negotiations before he joins the club.
He said on the Guillem Balague Transfer Show: “If Eden Hazard was absolutely focused at Chelsea, because you think you’re going to be there for 10 years, I think we’d see more consistent form from Hazard.
“And more respect towards the manager in terms of what he does on the pitch.
“Hazard is his own man, Sarri wants him to do a certain job so they’re both not finding common ground right now but Hazard – if he thinks he’s going to be there 10 years – will listen and perhaps apply that to his football.
“I think he is obviously waiting for Real Madrid to start negotiations with Chelsea.
“Real Madrid need to recycle, they actually are putting a lot of effort into developing some young players… but that is just something that has to go side by side with signing superstars.”
Hazard reiterated his desire to play for Real Madrid earlier this month.
He said: “Would I like to sign for Real Madrid? Why not?
“I have never heard from (former manager Zinedine) Zidane and if he goes to Manchester United tomorrow, for example, I would not be there.
“Real Madrid without Zidane is different, but it is still Real Madrid.”