Badly sprained ankle.
In fairness it did look a mess in the picture he posted on Twitter.
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The Mirror ran a story at the weekend saying he and Hughie had both given suspicious samples last year and had attended a meeting to be told they were under investigation. He was still allowed to take the Klitschko fight though which seems strange. Apparently they are both to aplear before a full panel later in the year but both of them deny any wrongdoing and even knowing anything about it.