Speaking to Sky Sports, the manager said, "That is something I think they have right now. That body language, in my opinion, is very, very important. It is something the players have to feel. And to be able to feel it, they have to feel that confidence, they have to feel emotionally prepared as well to make that step. They are growing.
"You want to maintain all the qualities we had in the past and keep improving. Don't lose them. Add, and add, and add, without losing anything. That is the aim of the club and every coach, to be better in every department. That is what this league requires."
He added, "That is a huge quality of theirs but as well their intelligence, their character, the passion they have for the game and how competitive they are. You have to add a lot of elements. One specific element is not enough at this level to make a huge impact on the team. But those two have brought a lot of qualities.
"To win big trophies, you need game-winners. You need world-class players who can win you the game at any moment, players who can open the door when it is closed. We are developing those players because they are necessary for the big moments."