Man Utd signing Kagawa: I have long way to go to match Park
Park has left United for QPR just as Kagawa begins his Old Trafford career.
"This is only the beginning for me," Kagawa told the Mirror.
"But Park Ji-Sung is the best player Asia has ever produced - there's no doubt about that.
"He played regularly for United for a long time and I can't be sure how long it will take me to establish myself in the team like him. But I will always work hard to do so.
"Watching him play for United motivated me a lot. I began to truly believe Asian players could play in big clubs.
"I was expecting we could help each other and play together at United. It's a shame that he left.
"But, like Park, I will focus every day on training and do my best to stay here a long time."