The Japanese playmaker has failed to score in 18 outings in all competitions this term and has just six goals in more than 40 appearances for the Red Devils.
Kagawa is well aware his scoring output is not as it should be and he is determined to put that right in the second half of the campaign.
"I've never had so much trouble not being able to score goals. Right now it's just trial and error," he told reporters.
"The season's still continuing, so I just have to find a way to recover my form. This is my big challenge."
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