Spurs are reportedly ready to offer £10m for the flying Dutchman, after he said he wants European football this coming season.
However, former Newcastle goalkeeper Pavel Srnicek, does not want Krul to leave but understands the time will come.
Pavel Srnicek: “A move to a so-called bigger club does not always turn out for the best.
“Tim is still young, and I think if he stays at Newcastle for another year or two and just gets more experience, he will have a good chance (of going to a top club).
“He was fantastic when Newcastle finished fifth, but he has had some injuries since then.
“It’s difficult, because you have to repeat the successful seasons you have and it is even harder to do it again.
“Tim can read the game, he is very good on the line and has a good presence.
“He talks to people, which is very important, and commands the area.
“You have also got to be good with your feet these days, and everything you have to have as a goalkeeper in modern football, he has got it.
“I think he is a fantastic goalkeeper for Newcastle, but the way the business goes, maybe one day someone will come in with money and he will go, leaving the club needing to find someone else.”