The Tynecastle side turned down a package worth £250,000 for the 19-year-old defender this week.
Neilson has stood by that decision and warned nobody will be leaving his squad for less than they are valued at.
He said: “They put an offer in which we believe was nowhere near his value. Jordan has a great future here. He’s a big player here, he’s a Scotland Under-21 international and captain.
“If he is going to go, it’s going to be for a lot of money. Every player has a price. I don’t want to sell him but if someone comes in with an acceptable value then we will look at it.
“But the offer that came in is nowhere near the value of a player of his calibre. We don’t need to sell.
“We have had a lot of cutbacks over the years but everyone is starting to get back on their feet again. When you get back on your feet you can start demanding money.
“Look at Hibs, ourselves, Dundee United as well. They have set a precedent of what we expect from players. We can’t get our best talent cherry-picked for buttons.
“In the past five or six years English clubs have taken the best talent at 16, 17, 18 and then they disappear down there.
“For them to be able to stay and play football, play 50-100 first-team games, then they can go down as proper professional football players and not just prospects can only benefit our game.”
One man Neilson believes is destined to go to English football is the man whose side he will take on this weekend.
Hearts travel to Dundee in the Scottish Premiership on Saturday and he has been impressed by their manager Paul Hartley.
Neilson, who played alongside Hartley for the Edinburgh outfit, added: “He was always football, football, football. I always knew he would stay in football because it was Paul’s life.
“Alex Neil has done fantastic at Hamilton and is now in the Premier League at Norwich. I’m pretty sure if Paul maintains the success he has had so far he will be down in England soon as well.”