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“Its just frustrating, his body will of course regenerate the blood they took in a matter of hours, but it of course weighs in his mind.
“He felt the other day after giving blood that he was too weak to train, but he will be fine come the day of competition.”
Powell will line up in the opening rounds of the men’s 100 metres dash on Saturday and he’s one of the favourites to win a medal.
He is expected to face the likes of Usain Bolt, Yohan Blake, Tyson and Justin Gatlin in the deciding race.