Blues legend Didier Drogba is leading the line for Gala this season.
"Didier was a legend here," Mata tells the official Chelsea website.
"I guess that he would be very excited about coming back. He did a lot of great things for this club and scored a lot of very important goals. In fact, he scored probably the most important goals in the history of this club.
"It would be difficult for us, though. He is still a top player and Galatasaray are a great team, but I think for the fans and for him it would be very special. Let's see what happens."
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