Kagawa missed Japan’s World Cup qualifier against Iraq because he felt a twinge in his lower back during training ahead of the match.
Japan coach Alberto Zaccheroni decided not to risk the 23-year-old playmaker.
The injury could see the highly-rated midfielder miss United’s home game against Wigan on Saturday.
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Summer 2016 is set to be a very exciting time for football fans, as this is when the long awaited Euro 2016 tournament kicks off.
Since Guus Hiddink arrived at the helm, Chelsea have improved considerably after a tricky start to the campaign.