Juventus coach Massimiliano Allegri has warned any players thinking about leaving the Italian champions should "consider things very carefully."
AC Milan coach Vincenzo Montella was encouraged by his side's display during the 2-1 friendly win against Bordeaux, his first game in charge.
Juventus have not made a move to sign striker Gonzalo Higuain, nor do Napoli want to sell him, the club's head of communications has said.
Bayern Munich began their preseason with a victory while Borussia Dortmund and Wolfsburg both fell in summer friendlies.
Massimiliano Allegri has urged Juventus to improve in Champions League play next season.
Medhi Benatia has been officially announced as a Juventus player and says he is looking forward to winning with the Serie A squad.