Liverpool's Mamadou Sakho is facing a lengthy suspension from the game after deciding not to challenge the results of his failed drugs test.
The France international has accepted the findings of a drugs test taken after the Europa League tie at Manchester United on March 17, which is understood to have revealed evidence of a fat-burning substance, and did not request that a B sample was examined before the Uefa deadline on Tuesday.
He will present mitigating evidence.
Liverpool have refused to comment on the defender's decision, insisting it is a private matter at this stage, and Sakho will remain unavailable for selection while Uefa's investigation continues.
Juergen Klopp's squad travel to Spain today (Wednesday) for their Europa League semi-final first leg against Villarreal on Thursday and Sakho was not in the travelling party.
His acceptance of the A sample's findings may hasten the disciplinary process, meaning his suspension from the game will start earlier than had he challenged the results.
His team-mate Kolo Toure was handed a six-month ban by the Football Association for failing a drugs test in 2011 as a result of taking his wife's diet pills.
A similar punishment would cost Sakho his place at the European Championship to be held this summer in France.