Sporting Lisbon manager Ruben Amorim admitted he was sad to lose right wing back Pedro Porro.
The 23-year-old has signed for Tottenham on deadline day after a protracted negotiation.
Porro, who was manager Antonio Conte's prime winter target, cost Spurs around 45 million.
Amorim told reporters: "Our relationship is very close, he will be missed.
"In football we get used to change from a very young age. One day they are our children, our best friends, and now he is Conte's son.
"If we play against him, I already know his difficulties. We remain friends, I move on, now my favourites are others. My players are always the best in the world. Porro will be a player for another team and I wish them the best of luck.
"A player with Porro's characteristics cannot be arranged, and that's why they beat his clause. Looking at a player who is a right back and has so many goals and assists, we have to try to build another one, that's what we're going to do."
