While the English transfer window closed on Thursday, sides in La Liga, as well as other European leagues, can still make a bid for Premier League stars.
Sarri said: "I think it's impossible. It's impossible because, here, the market is closed. We cannot change important players now, so I think it's impossible.
"Hazard is with us. I think, definitely. Not a problem. I have spoken with him three or four times for everything. He never said something about the market, so I think he's very happy to stay here."
Sarri added: "I don't want to discuss about contracts, its not my job. My job is on the pitch. My job is to win matches, not contracts. But I have seen a player who is very happy to stay here."
He explained: "For tomorrow, I think Azpilicueta. But it's not the final decision. I want to know well the players. I want to know well the man. Then, when my idea is clear, I will make a decision. The final one."