UPDATED

A "vial'' of urine found in plumbing at the home ground of the Gold Coast Titans was in fact a jam jar which could have been at the stadium for five years, according to the club's chief.

Titans chief executive David May said there would be no further police investigation after it was discovered the urine in the jar was so old it could not be tested.

The jar was discovered in the dressing room plumbing by police conducting a bomb-detection training exercise at the Robina ground as part of preparations for the G20 summit in Brisbane next year.

It was possible the jam jar was placed in the Robina stadium during its construction.

Mr May was advised of the discovery by police on Thursday, the same day a major report linking Australia's major sports codes to widespread illicit drug use and organised crime was released.

‘‘We were advised there was a vial," he told ABC Radio earlier on Friday.

Mr May initially described the find as a mystery, saying it could belong to any one of the 45 teams which had played at the stadium in recent months.

"We established first up what the facts of the matter were and at this point we don’t really know very much," he said.

‘‘Obviously there’s been 45 other teams [that] have been through the changing room in question since we last used it."

The Titans played their last 2012 home game at Skilled Park in early September and resumed training in November.

‘‘The most recent teams have been through the ARU through the Rugby Sevens - they had 44 teams through there - and there was an Australia/Argentina test match through there," Mr May said.

He said the vial was handed to the Australian Sports Anti Doping Authority for investigation.

Police said officers were involved in a training exercise at the stadium on the weekend, not on Thursday as previously reported.

'‘Police conducted the training on the weekend, but we are unable to comment any further,’’ a police spokeswoman said.

However, Skilled Park venue manager David Lloyd said police had been at the stadium on Tuesday.

He said he had not yet been formally advised of the discovery, adding the "vial'' could have been there ‘‘for a number of years’’, although police regularly staged training exercises at the Gold Coast stadium.

‘‘I’m sure in a sweep they don’t go round and open every toilet system that we’ve got in the stadium,’’ he told ABC Radio.

‘‘We don’t even know what it was that was found ... whatever it is could be anything and it could be from or by anybody.’’

He said the dressing rooms were not secured, even outside the football season.

‘‘Anybody could walk in,’’ he said. ‘‘They’re used for a myriad of purposes.’’

An Australian Rugby Union spokesman said the code had not been approached in regards to the discovery.

The spokesman confirmed Skilled Park hosted the Wallabies September 15 match against Argentina, and the IRB Seven’s World Series on October 13 and 14.

During competition union players are required to provide urine samples in the presence of an ASADA or World Anti-Doping Agency representative.

It is understood the ARU will not take any action, until such time as it is approached by authorities.

Earlier on Friday, Mr May stressed there was no evidence to suggest the vial of liquid was linked to the Titans.

"It's not really something we can do anything about, and to be honest I'm not entirely sure it's something we should be doing something about, because it's not something that was found in our offices, in our building," he said.

Mr May said he believed the NRL was at the ‘‘higher level’’ of anti-doping compliance in Australian sport, but conceded the vial discovery would ultimately tarnish the code and the club.

‘‘The media reporting of the issue will eventually tarnish our reputation, but the facts of the matter don’t. The facts of the matter are that 45 other teams have been through those changing rooms,’’ he said.

‘‘We don’t know how long that sample has been there. There’s hundreds of teams that [have used] that dressing room over the life of the stadium. I am not worried that the facts of the matter will impact us.’’

In a statement on Thursday, Mr May pledged the Titans' full support for the NRL’s investigation into doping and integrity issues after the release of the Australian Crime Commission’s scathing report.

“As a club we have a zero-tolerance policy that is strictly enforced,’’ he said.

‘‘We believe there is no place for drugs in our game. I’ve got absolute confidence that the club is fully compliant with the standards set and regulated by ASADA.’’