Swansea City have revealed defender Ijah Anderson has tested positive for a recreational drug.
Anderson played 13 times for Swansea last season
The 29-year-old was suspended by the club on 22 November after they received confirmation he had failed a random drugs test three weeks earlier.
Anderson will fight the charge, which carries a minimum six-month ban.
"Ijah is innocent until proven guilty and we are still waiting for the final outcome of the FAW hearing," said Swansea chairman Huw Jenkins.
"But, obviously, if it does turn out that he has used drugs our policy will be one of zero tolerance and he will be finished with this club."
Swansea manager Kenny Jackett has spoken to Anderson about the possible circumstances which led to him failing a drug test on 1 November.
Jackett told BBC Wales Sport he was unwilling to reveal that information before the FA of Wales hearing on 19 December, and refused to disclose for which drug Anderson had tested positive.
But Jackett did say the club will be backing the player upto the hearing, where Anderson will be represented by the Professional Footballers' Association.
"All the facts will be put on the table and discussed," said Jackett. "It will give the man a chances to speak and put his side of the story across.
"He has failed a drugs test, that is the case, but we now need to look into it deeper to see the circumstances.
"I don't like talking about them before the hearing because you can get branded before you've had an opportunity to defend yourself.
"These are very serious allegations."
Anderson joined the Swans on an initial month's deal in November 2004 after being released by Bristol Rovers.
He then signed an improved deal in January this year which tied him to the club until June 2006.
The left-back has made just six substitute appearances this season.
He was due to make his first start in the LDV Vans match against Rushden & Diamonds on 22 November, but was immediately withdrawn when Swansea learned of his positive drug test.