The 24-year-old has pleaded with fans not to compare his Premier League showings with his international displays and wants his side to "play as a team" against Italy
The former Borussia Dortmund midfielder moved to Old Trafford at the start of last season and enjoyed a promising debut campaign, despite being kept out for two months through injury.
However, the 24-year-old’s showings for his national side have led many supporters and pundits to make an unfavourable comparison between his international and club form – something Kagawa has warned against.
"Playing for club and country are two very different things and you shouldn't always compare them," Kagawa told reporters.
Japan lost 3-0 to Brazil in their Confederations Cup opener on Saturday and Kagawa has called for an improved performance against Italy on Wednesday.
"We have to get ourselves in order and play as a team tomorrow," he said. "As for myself, I want to be aware of what I didn't demonstrate [against Brazil] and bring that to the pitch."
Japan are bottom of Group A after their opening day defeat, while Italy are second after beating Mexico 2-1.