Juve meet Gala in their second Champions League group game.
"We’ll need to remain fully alert when playing against him,” said Bonucci.
“Drogba is certainly one of the best strikers in the world and has gone to Galatasaray, after his experience in China, with the desire to keep surprising.
“He inspired Chelsea to Champions League glory and tomorrow we’ll be up against a motivated striker who will want to do well.”
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