The Japan fullback has established himself as a key member of Stramaccioni's squad.
Strama said: "I decided not to take him to Kazan because he was one of the players who had done the most travelling for his national team and other things. He's one of the players who has improved the most since I've been here and he can still become even better. And he's also learned the Bari dialect perfectly
"I think he's also become a better man for that! [smiling] We're holding on tight to him. The individual work that he's doing with Beppe Baresi is also important. A good example of this is that last cross from the left. If he also becomes good with his left then he'll be even more dangerous. He's humble and he works hard."