The Japan international's £17million move from German double winners Borussia Dortmund is expected to be rubber stamped soon as he awaits a green light for a work permit before passing a medical.
"When you look at the football scene, it's the best league in the world. You've got the world's biggest clubs like (Manchester) City, Arsenal, Liverpool, Chelsea all in the same league which is fascinating.
"In the Bundesliga, the only games that compare are the ones against Bayern (Munich). I feel like I'd be able to gain so much by playing big games on a regular basis, including the Champions League. I can't help but be excited."