The man, identified as Abdelmoumaim H. And who is in his 20s, was arrested Tuesday and charged with "participating in the activities of a terrorist group," the prosecutors said.
Five other people who were picked up during the January 15 raids face the same count of terrorism, including three Belgian nationals in their 20s who were placed in custody.
The Brussels court prolonged for a month the custody of those three suspects, identified Wednesday as Marouan E, Mohamed A and Billel H.
Belgian media identified him as Marouan El Bali, 25.
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During the police raid on a hideout in the eastern town of Verviers, terror suspects Sofiane A, a dual Belgian-Moroccan national, and Khalid B, a Belgian citizen were killed. Both were in their 20s.
Belgian media said El Bali, who is suspected of providing logistics support to the cell, was detained during the raid on the house in Verviers.
He has denied the accusations and his lawyer said the young man, who lives in Brussels, was just visiting a friend, according to Belgian media.
Dutch authorities said Tuesday police in the city of Utrecht raided the family home of a young man believed to have links to the cell dismantled in Belgium.
However, he is thought to have fled Belgium for Spain or France.
Spanish media have identified the suspect as Zaid Kouliss, who was reported missing by his parents last year.
Also, Belgium has asked for the extradition of two fugitives arrested in France.
He has agreed to be extradited to Belgium, with Belgian prosecutors saying "his extradition could take place in the following days.