The 24-year old has signed a six-month loan deal with the Nerazzurri from Serie A rivals Cesena and is well aware that he will have to continue his rapid improvement if he is to mix it for a spot in Internazionale's starting line-up.
"I'm very happy to have joined Inter, the world champions," Nagatomo told Inter's official website.
"Now I have to prove to everyone that I can play.
"What's happened today came out of the blue, but now that I'm here I have to give it everything I've got."
And Nagatomo was looking forward to becoming a part of a squad filled with so many talented players.
"But I expect I'll soon make friends with the whole team."