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The Japanese international was recognised as the division's top runner, but admits that he has much to improve on in 2012 in order to compete in Europe's big matches

A study released by German footballing magazine Kicker this week showed that Borussia Dortmund attacker Shinji Kagawa has covered more ground than any other player in the first half of the Bundesliga season.

The statistics reveal that the Japanese player runs an average of 12.36 kilometres per 90 minutes of playing time.

Kagawa noted the endorsement of his hard work on the field, but recognised a need to excel even further in 2012.

"If I don't raise my abilities to another level, even if I can play well in Germany I may not be able to perform in the Champions League," Kagawa told reporters upon his return to Japan on Thursday.

"My value can only go higher if I can perform well in the Champions League."

After watching Dortmund's DFP Pokal match against Fortuna Dusseldorf from the bench due to a stomach ailment, Kagawa has recovered and is expected to play in a Friday night charity match in Sendai.

The former Cerezo Osaka man will spend his winter break working on improving his physique and preparing for the second half of the Bundesliga season.

"I want to improve everything [next year]," Kagawa continued. "For example even in the Champions League I want to be able to win in those one-on-one situations and take the shot."

Dortmund have been eliminated from European competition altogether this season after finishing bottom of Group F in the Champions League.

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