Man Utd midfielder Kagawa: I must get stronger
Kagawa, who only weighs 9st 9lbs, admits he has to grow stronger to be able to compete in English football following his £12million move from Borussia Dortmund.
"I've realised that I need to limber up and strengthen my body," he said.
"There are some tough games coming up. This injury may be due to travel and fatigue but I can get by if I take good care of my body."