The suspect was identified as Salah Ghemit, who was known to authorities before his arrest, and was charged with arms possession and having links to extremist groups, the source said.
Ghemit is believed to be connected to Akim and Khalid Saouti, two brothers charged in Brussels on Wednesday with belonging to a "terrorist group". They were believed to be planning an attack with a large stash of weapons including Kalashnikov rifles.
The pair, arrested in the Brussels suburb of Anderlecht, are brothers of convicted jihadist Said Saouti, a member of the Kamikaze Riders, a notorious bikers' club based in the Belgian capital.
A source close to the probe said authorities feared the three men were planning "an imminent attack in France or Belgium."
The French suspect has previously been jailed four times for acts of violence and theft and was put under surveillance after leaving prison in May 2015 where he was believed to have been radicalised.
He was then observed making several trips to Belgium, where he met the Saouti brothers with all of them seen handling bags at a garage in Anderlecht.
Investigators from a joint Franco-Belgian operation had on Wednesday confirmed arresting a 42-year-old man just outside Lille on suspicion of links to the Kamikaze Riders who was planning a "violent attack".
France and Belgium have suffered a string of deadly attacks claimed by the Islamic State group in recent years.
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