Tottenham have agreed a £600,000 fee with Brazilian side Cruzeiro for defender Rodrigo Defendi.
Defendi has become the first Spurs signing under Santini
The teenager, the first prospective signing under new coach Jacques Santini, will join on a four-year deal.
"We are delighted to announce that we have agreed terms," said a statement on the Tottenham official website.
The 18-year-old, who was born in Ribeirao Preto in Brazil, will link up with the rest of the squad for the early part of pre-season.