Dortmund's Karetsas back in team training after circulatory problems

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What happened
Konstantinos Karetsas has returned to Borussia Dortmund team training from circulatory issues, the Bundesliga club said on Wednesday. Summer signing Karetsas was taken off on a stretcher during last week's Champions League match against Spain's Villarreal and underwent a series of tests in hospital.
Summary assembled by rule from the sources below