Croatia coach Slaven Bilic is convinced Tottenham have signed a player capable of becoming the world's best.

"Only Kaka is better than (Luka) Modric," says Bilic. "He's unstoppable, hard even to foul.

"Tottenham is perfect for Luka, better than, for example, Chelsea, who could have bought him, Messi and Robinho and then Luka could have ended up on the bench."