My logic would be that we get Berge and Ndiaye to sign new contracts, not to tie them to us for another 3 years but purely so they know that they're integral to the team now and any future success moving forward whether they're here or not at the end of next season i.e. getting half decent money for them when they eventually leave.
"Ili, if you have a good season, people will be queuing up to sign you. We need the money and know that realistically, unless you have a Mousset type meltdown, the football world is your oyster. You could set us up for the next 5 years if you sign and we won't stand in your way if a suitable offer comes in at the end of the season"
Insert various clauses around if clubs playing in Europe make an approach, any offer over £25m for Ndiaye and he can walk if he wants to, sell-on clause whatever it has to be.