john stones is brilliant, probably irreplaceable - but i think people are in cuckoo land by saying we wouldn't improve with his sale. i agree it's a statement of intent not to sell at any price, but if they come in with £60m - do people really want us to say no? you do realise taht can get you 3 or 4 top quality first team replacements.
i wouldn't sell atm, unless they offer something in that ball park - but martinez won't even have replacements in mind - it'd be too soon to plan it all - we're not liverpoo, thankfully and are not just going to chuck £20m at a defender and hope it works.
his price will rocket in the next couple of years - more top class teams will become aware and higher bids will come in. he's a confident professional lad, i don't think interest will affect him and i don't think he's the kind to push for a move.