Portlaoise boxer Michael O'Reilly is reportedly on his way home after the Irish Athletic Boxing Association confirmed that he will not compete in the Rio Olympics and that he had left the Olympic village.
The IABA criticised O'Reilly for taking a supplement without consulting their medical staff.
"We are very disappointed that Michael may have taken any supplement without consulting the IABA High Performance Support Team,” the IABA said in a statement.
“Educating athletes of the risks proposed by supplements is provided to all our boxers as part of the High Performance Programme,” it also noted.
The IABA said that O'Reilly had left the Olympic Village and that arrangements were being made for him to return to Ireland.
"We can confirm that Michael has now left the Olympic Village and will have no further involvement in the Rio Olympic Games.
"The Olympic Council of Ireland (OCI) will be making arrangements for him to return to Ireland as soon as possible.
"The IABA is fully committed to the Irish Anti-Doping Rules.
“Michael’s adverse test result initiated a process as set out in those rules.
“This process remains underway and until it is completed we are not in a position to comment further."