I don't think we'd let him go at all for another season after this one mate, their is no actual incentive for any club to sell a younger player in the prem anymore whose market value will only rise.
Sterling went in the summer but he kicked up the biggest stink any player really could do to get that move and 99% of players wouldn't go that far, also they still ended up getting i'd say double what his true value was, so thinking of Rom as genuinely a 40m quid player then it tells you just how ridiculous a bid would have to be to get him
The incentive of selling in many ways has been removed due to the huge influx of TV revenue, a club can only have so much of a wage bill and can only attract a certain quality of player - so it kind of removes the old incentive of selling to buy that most clubs had to, now most clubs will be able to spend a decent amount without selling its star assets
Take us - spent roughly 20m this summer without any sale needed, factor in we could have shifted Naismith and Mirallas for a combined 20m if we had needed money to buy a target, plus with all clubs now having a decent spending power it means those squad players like Naismith, Jelavic, Anichebe etc fetch far more as their is more possible buyers out their
The whole way transfers for the none SKY5 clubs are for the foreseeable future has changed a huge amount