Mamadou Sakho faces an uncertain short-term future after it was revealed today that he had failed an anti-doping test.
The Liverpool centre-back is not officially banned but it was decided by the player, chief executive Ian Ayre, and manager Jurgen Klopp that he would be unavailable for selection until the matter was dealt with.
The Frenchman was found to have fat-burning products in a sample he gave following the second leg of the Reds' Europa League success over bitter rivals Manchester United.
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Sakho was replaced in the starting line-up today by Kolo Toure - who failed a test for similar reasons in 2011 - and watched from the stands as Liverpool threw away a two-goal lead against Rafa Benitez's Newcastle United.
After the game, Klopp spoke about his 26-year-old defender and refused to comment too much on the issue.
According to Liverpool Echo writer Kristian Walsh, the German boss said: "I knew since yesterday but haven't had the chance to speak to Sakho. Today was not about missing Mama. We'll know more next week."
You can see some of Klopp's post-game interview with Sky Sports below.
Sakho has been in excellent form for Liverpool since the arrival of Klopp on Merseyside.
After battling with Dejan Lovren under Brendan Rodgers, he had established himself as an integral member of their back four.
With the Reds looking to reach the Champions League via the Europa League, he will be a big loss. His chances of playing at Euro 2016 also look slim.
Sakho still has the chance to request his B sample be tested.