The International Olympic Committee (IOC) should do more to protect workers producing apparel for the upcoming Athens Games, the International Trade Confederation of Free Trade Unions (ICFTU) said on Tuesday.

According to the ICFTU, the world's largest trade union umbrella group, the IOC has not sufficiently addressed the complaints of poorly paid workers despite having "ultimate authority" over the licensing of goods bearing the Olympic logo.

In response, the ICO argued that the two companies it directly works with, Dale of Norway Holding ASA and Japan's Mizuno Corp, had strict codes of conduct.

However, it added that it couldn't control the procedures of some of its affiliated organisations.

"The IOC does not manage and control the licensing of the Olympic-related marks by National Olympic Committees and the Organising Committees for Olympic Games," the committee said in a statement.

"Nonetheless, these organisations have their own correct practices in place."

The ICFTU recently published a 77-page report claiming labour abuse by leading international sporting goods manufacturers linked to the Olympics.