I would rather have Sane for the next two years and then let him leave for free. His pace and decisiveness could be the diffeerence when it comes to the Champions League.
Unless there is an outstanding candidate to replace him then the 90 million we would get for him is not worth it.
Let him play for 2 more years, make us more successful and then let him leave. Its pointless weaking our squad, especially if we have a transfer ban coming up.
We got him for a bargain price and he is on relatively cheap wages for someone so good. Let him play out his contract. 2 more years of his services is worth more than the fee we will get.