The France international has reportedly opted not to request his B sample be tested after his initial test revealed traces of a fat-burning substance.
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The France international was left out of the weekend's draw against Newcastle after it emerged UEFA has flagged up an apparent anti-doping violation relating to a banned substance as a result of a test following the Europa League tie at Manchester United last month.
Liverpool have refused to comment on Sakho's situation as allegations relate to the player only and they are unlikely to change this stance until the defender and UEFA have resolved the matter.
Sakho was not on the team's flight for their Europa League semi-final first leg in Villarreal as it is understood the club and the player have jointly agreed he will remain unavailable for selection during this process.