The French national, identified as Reda K, was arrested in Argenteuil, northwest of Paris, late last night with a small quantity of explosives.
He was convicted in Belgium in July along with Abdelhamid Abaaoud, the ringleader of the November 13 attacks on the French capital, police sources said today.
Reda K was found guilty in absentia in Brussels of being part of a jihadist network planning to go to Syria, the sources said.
Interior Minister Cazeneuve said he was suspected of "being involved in the plan at a high level."
However, while Cazeneuve hailed a "major arrest", he said there was "no tangible evidence linking the plot to either the attacks in Paris or Brussels".
The minister added that the suspect had been under surveillance "for several weeks" and that the arrest was also the result of "close and constant cooperation between European services".
The arrest comes two days after 31 people were killed in suicide bombings at Brussels airport and on the city's metro, putting security services across Europe on high alert.
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