EU nations have long wanted to bolster their capacities to handle the clearing operations within the Eurozone.
They are also concerned the City maintains a tight grip on the industry at a point when Britain’s financial regulations begin diverging from the bloc’s rulebook.
Swaps are used by firms looking to protect themselves against unfavourable changes in interest rates.
Brexit has seen a reshuffle in global trading of euro swaps, with business moving out of the capital to EU finance hubs, such as Paris and Amsterdam, as well as to Wall Street.
But UK-based ICE Clear Europe and London Stock Exchange Group’s LCH have kept a stranglehold on clearing – another lucrative financial market.
They play a key role as a middleman between buyers and sellers, guarding against defaults that could spark a chain reaction across the whole market.
Brussels doesn’t want to leave itself reliant on UK market supervisors making correct choices for Europe in event of a clearing house crisis.
EU diplomats and officials also recognise the concerns are driven by European financial centres wanting to snatch the business away from London.
Top eurocrat Mairead McGuinness earlier this month described the volumes cleared in the City as “eye-watering”.
The EU’s financial services commissioner insisted she was prepared to take action if the industry refused to shift to Europe voluntarily.
Financial services firms have shown little interest in making the cross-Channel hop to continue servicing their continental clients.
EU officials have held two private meetings with investment bankers and asset managers in the hope of convincing them to relocate to Europe.
But insiders said finance chiefs rejected the proposals in favour of maintaining London as Europe’s major hub.
One source said: “The banks and asset managers were of the same view that you can’t force it to move from the UK to Europe.”
A second added: “The Commission has realised how difficult it is to do this.”