criticised Bayern Munich after they went on the record about wanting to sign Blues winger Callum Hudson-Odoi.
Bayern have bid £35m for the 18-year-old and their sporting director, Hasan Salihamidzic, has said the German club “really want to sign him”.
Hudson-Odoi has 18 months left on his Chelsea deal.
“It’s not professional, because they are talking about a player under contract with Chelsea,” said Sarri.
“So they didn’t respect our club, I think.”
Chelsea have offered Hudson-Odoi a new deal and Sarri, who said he wants to sign two players in January, reiterated that he wants the teenager to stay at Stamford Bridge.
“We are very happy with the player because he is improving,” said the Chelsea manager.
“He is improving a lot I think in the defensive phase. Now, he needs to improve in some movements without the ball.
“He is working very well and I’d like to have him in the future.”
Hudson-Odoi, who made his first-team debut in the FA Cup in January last year, made a second successive start in the Carabao Cup first-leg defeat by T