The 28-year-old has consistently been linked with a move to Spanish giants Real Madrid
The Blues boss wants his star player to remain at Stamford Bridge but has insisted it is only right to let him leave if he desires a move away.
Hazard, 28, has been linked to LaLiga giants Real Madrid over the past several transfer windows, and he has himself has flirted with rumours of a potential move to the Spanish capital.
Sarri has recently made it clear that youngster Callum Hudson-Odoi will remain at the club in this window and quite possibly the next.
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Sarri reveals what his bosses have told him about Hudson-Odoi's future
But he claimed Hazard has the right to decide his own future and has given him the green light to leave Stamford Bridge should he want to.
Speaking to the media ahead of Chelsea’s trip to Bournemouth, Sarri said: “Eden is 28. If he wants to go, I think he has to go.
“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.”
Hazard has been hugely successful since he moved to Chelsea from Lille in 2012, helping the Blues to two Premier League titles in six-and-a-half seasons with the club.
This season he has continued to impress – with ten goals and ten assists in 22 matches.