Maurizio Sarri believes Bayern Munich have not acted in a professional manner during their open pursuit of Chelsea winger Callum Hudson-Odoi.
The 18-year-old attacker has attracted interest from the German champions this month, with Bayern said to have been alerted to the situation by his apparent unwillingness to sign a new contract.
Bayern are reported to have tabled three bids for the prospect, who is apparently eager to leave the club in search of greater first-team exposure having appeared just once in the Premier League this term.
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Hasan Salihamidzic, Bayern's sporting director, confirmed the club "absolutely want to sign" Hudson-Odoi on Wednesday, angering Chelsea.