French and Moroccan authorities identified the man as 26-year-old Gelel Attar, a Belgian of Moroccan descent.
A spokesperson for the Moroccan Central Bureau of Judicial Investigations said Attar is from Molenbeek, Belgium, and knew the Paris attackers well.
Molenbeek is an impoverished suburb of Brussels with a history of links to terror plots.
It has a large, predominantly Muslim population of first-, second- and third-generation immigrants from North Africa and has gained an unwelcome reputation as a hotbed of jihadism.
Attar was being held in Sale, close to the Moroccan capital, Rabat, the spokesperson said.
His family, which was notified of his arrest immediately after his capture, is not under investigation, according to the bureau spokesperson
Belgium couldn't say for sure whether Attar would be extradited. Read more on edition.cnn.