Football's governing body FIFA has been warned by international trade unions that migrant workers in 2022 World Cup hosts Qatar were subjected to conditions of "modern slavery".



FIFA said it would take up the issue with Qatari authorities and that labour rights would in future be included among the criteria considered when countries bid for the World Cup.



"We asked the FIFA secretary general (Jerome Valcke) if they wanted their stadiums to be built by slave workers, by exploited labour," Ambet Yuson, general secretary of Building and Wood Workers International (BWI), said.



"Ninety-four percent of workers are migrants in Qatar. It's basically modern slavery," he said after the meeting at FIFA headquarters.



"They are migrant workers from India, Nepal and Bangladesh; they go there and their passports are withheld, sometimes they don't get paid their salaries or they are six months late and have no other options.



"It's terrible; I was there, their living quarters are really bad, it's a bad situation."



"FIFA said they will use leverage, because Qatar wants the World Cup. We told them it's serious and we are going to campaign. We said we want to see some action in six months."



Yuson said he was also worried that delays in the building of stadiums in Brazil for the 2014 World Cup could lead to a last-minute rush.



"When you try and rush, accidents happen," he said. "There have been 12 strikes already. Wages are very low, there are a lot of contractual workers and there's the issue of health and safety."



Representatives from the International Trade Union Confederation (ITUC) and Swiss Union Unia also took part in the meeting with Valcke.



FIFA said in a statement: "It was agreed that FIFA and ITUC will work jointly over the next few months to address labour issues with the Qatari authorities.



"It was also agreed to add labour-related criteria to the bidding process of future FIFA World Cups.



"We have a responsibility that goes beyond the development of football and the organisation of our competitions."