Did the Celtics promise German PG Dennis Schroeder they'd draft him?

It seems like an odd thing to do, but that's what NBADraft.net is reporting:

 It's quite possible Schroeder may be gone by the time Boston picks, in fact NBADraft.net actually ranks him as the 11th best player in the draft.

Related: Chad Ford mock draft: C’s pick PG Dennis Schroeder at 16

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