Arsenal manager Arsene Wenger has criticised Roberto Mancini after the Manchester City boss said he was hopeful of signing midfielder Samir Nasri by the end of the month.
Nasri, 24, has a year left on his Arsenal contract and the London club are keen to keep his services.
Wenger said, "We do not make any comments on players who are under contract in other clubs.
"These comments are not allowed and Roberto Mancini should be informed."
Mancini said on Saturday he was keen to sign both Nasri and Atletico Madrid's Argentine striker Sergio Aguero.