For me, probably Mbappe stays at Monaco next season - guaranteed to start thus showcasing his talent and enhancing his chances to be selected for the French national squad in the WC.
Rumors suggest that Mbappe wants to be traded to Madrid eventually - but given the upcoming WC, I suspect he'd not transfer to Madrid this season even if an offer were to be made.
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Meanwhile, Monaco will not sell off too much of their squad - Silva and Mendy and that's it? Probably I'd think. Silva and Mendy and Mbappe? - pretty risky if Monaco wants to qualify for the CL in 2017/2018.