Rhys Williams, the 400m hurdler, has become the latest Wales athlete to be forced out of the Commonwealth Games in Glasgow after being charged with an anti-doping violation.
Team Wales have withdrawn the bronze medallist from Delhi 2010 after confirming the 30 year old's positive test came from the Glasgow Grand Prix on 11 July.
Williams becomes the second Welsh athlete to be hit with a suspension for an anti-doping violation in the last week, after 800m runner Gareth Warburton was suspended last week.
UKAD chief executive Andy Parkinson said: "UK Anti-Doping can confirm the provisional suspension of athlete Rhys Williams after being charged with committing an anti-doping rule violation under the IAAF Anti-Doping Rules.
"The athlete has the opportunity to respond to the charges against him, and to have those charges determined at a full hearing before the National Anti-Doping Panel.
"UK Anti-Doping will not be making any further comment."
The Welsh team have endured miserable preperation for the Commonwealth Games.
A number of high-profile competitors have pulled out including world champion cyclist Becky James, triathlon pair Non Stanford and Helen Jenkins while Olympic boxing silver medallist Fred Evans was refused accreditation.