Vice-president of the EU Parliament Eva Kaili was suspended from her party and Parliament group after being arrested in Brussels on Friday by police investigating alleged lobbying by World Cup hosts Qatar.
Greek socialist MEP Eva Kaili, 44, is being questioned after the arrests of four other people as officers searched 16 properties earlier on Friday.
This is said to include Ms Kaili's partner as well as Luca Visentini, 53, who is the current General Secretary of the International Trade Union Confederation, ITUC.
The ITUC said it was 'aware' of the media reports, but had no further comment to make at present.
It is understood all four of those originally arrested are Italian citizens or of Italian origin.
Kaili is the partner of one of the four, a parliamentary assistant with the European Parliament's Socialists and Democrats group, said a source close to the investigation.
Belgium's federal prosecutor announced the earlier arrests after 600,000 euros in cash was discovered when police raided 16 addresses raids in the capital Brussels.
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