The 18 year-old has been brought into the first team by Flick over the past year, with big expectations around the midfielder.
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However, with Dro's contract carrying a €6m buyout clause, his agents have informed they're intention to leave for a club abroad in January, with PSG favourites to land his signature.
Speaking yesterday, a frustrated Flick said: "I said before with Dro, if it's not done I will not answer this question, but it's football.
"Sometimes it's like that, that, yes, you do not agree with what they are doing, but they are 18, they are old enough to make decisions, they have people around them.
"Of course, when I see like ... no, no, I don't want to talk anymore, it's enough."