The Real Madrid ace moved to Spurs in 2008.
Mamic recalled to Four Four Two magazine: "We already had an agreement for Modric to move to London. I asked Levy (Daniel, chairman) for five Spurs jerseys and he told me that he would give them to me, but that at that point Tottenham would pay a lower sum for the player's transfer, given that from the agreed €21m it would be subtracted.
"Levy is the best negotiator in the world. This story made me realize how much he values every single euro coming out of Tottenham's coffers."