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Arsenal manager Mikel Arteta may have improved the club's defence to concede fewer goals but he now has the task of plugging a leak at his club after a clash between team mates in training was reported by the media in vivid detail.
British media reports said defender David Luiz and midfielder Dani Ceballos had clashed in a training session following a late challenge earlier this week, with Luiz drawing blood after hitting Ceballos in the face.