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.
"I want to play (in the hole)," Kagawa told the Kyodo news agency on Wednesday.
"I feel like that's where I play my best football. I plan on working hard so I can win my place at the position.
"They're one of the biggest clubs in the world, and I was given a chance to play for them. I took a lot of things into consideration, like the fact that they've got a deep squad, their style of football and it wasn't an easy decision.
"But I wanted the challenge."