Liverpool defender Mamadou Sakho is being investigated by UEFA over a possible anti-doping violation.

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Liverpool defender Mamouda Sakho investigated over anti-doping allegation

Player left out of squad to face Newcastle United in Premier League Saturday

CNN  — 

Liverpool defender Mamadou Sakho is being investigated by UEFA, European football’s governing body amid allegations that he failed a drug test, the club has confirmed.

Sakho has been a key player for the Anfield club in recent weeks, scoring in two of its last three matches.

However, he was not selected for Liverpool’s Premier League fixture against Newcastle United Saturday.

A statement posted on Liverpool’s website shortly after team news was announced read that “a formal communication was received from UEFA (on Friday) stating that they are investigating a possible anti-doping rule violation by Mamadou Sakho.”

“The player will respond to UEFA on the matter.”

“The player is currently not subject to any playing suspension. However, the club, in consultation with the player, has decided that while this process is followed the player will not be available for selection for matches.”

“There will be no further comment at this time.”

CNN is reaching out to Sakho’s representatives. The player himself has yet to comment.

UK based news agency, The Press Association, reported that Sakho has until Tuesday to provide a B-sample.

Sakho’s Liverpool teammate and fellow central defender, Kolo Toure, was suspended for six months in 2011 after failing a drugs test while at former club Manchester City.

Toure tested positive for a banned substance contained within a weight-loss drug given to him by his wife.

Liverpool meets Newcastle United in the Premier League Saturday before traveling to face Villarreal in the semifinals of the Europa League on Thursday.

Read: British doctor denies report he doped 150 sports stars

HARLOW, ENGLAND - JANUARY 19:  An analyst prepares a sample for testing in the anti-doping laboratory which will test athlete?s samples from the London 2012 Games on January 19, 2012 in Harlow, England. The facility, which will be provided by GSK and operated by King?s College London, will test over 6250 samples throughout the Olympic and Paralympic Games. Over 150 anti-doping scientists will work in the laboratory, which measures the size of seven tennis courts, 24 hours a day.  (Photo by Oli Scarff/Getty Images)
British doctor accused of doping 150 athletes
02:13 - Source: CNN