So the story went, but it's never been proven that any such promise was ever made.
It's a well known fact that Berbatov, Carrick, Modric, and Bale all handed in transfer requests.
Look, I wasn't having a pop at Spurs. It is fact that Levy likes a deal (and why not, he's bloody good at it!) and during his time at Spurs, he's sold a fair few of your star players. I'm pretty sure he doesn't want/like to sell the best players really, but he's done plenty of it.
We've sold a fair few ourselves too; Alonso, Mascherano, Torres, Suarez, Sterling, etc. **** happens



