But Sarri said: "There is not a Willian problem".
Chelsea have only signed Jorginho for their first team so far this summer after securing him for £57m (€65m/$86m) from Napoli on the same day Sarri was unveiled as head coach.
Willian missed five days of training due to passport issues, but the forward's absence fueled transfer speculation the 29-year-old was angling for a move away from the club. The Spaniard previously played for La Liga club Barcelona, where he made more than 300 appearances and collected around 20 titles, including three Champions League triumphs. If Courtois tomorrow says to me the same [as the agent], then I have to speak with my player, of course. "So I don't know".
Courtois's agent, Christophe Henrotay, has said the player wants to move to Real Madrid to be closer to his daughter, who lives in Spain.
"We are not at the top level now but we have to try to have a good performance and result".
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Sarri has met both Roman Abramovich and the club's director Marina Granovskaia, but his approach to transfers is much more hands off than predecessor Antonio Conte's was.
Bournemouth will be hoping to wrap up the signing of Colombian defensive midfielder Jefferson Lerma for a club-record fee. "I want to hear from [Thibaut] Courtois", he said following Chelsea's 2-0 defeat to Manchester City.
"I spoke yesterday with him about him being late, not his future", Sarri told a news conference on Friday. "It is very hard in this moment".
"It is very good for me, I am really happy here in the club, with my teammates, the supporters and the club in general", the Spanish global told Chelsea's official website. 'It depends especially on him I think.