Last week, thieves stole the pieces from Molinari's former workshop in Saint Donat, about 150km north of Montreal.
Six paintings will be stapled back on frames but two others will need to be restored after being damaged in the robbery.
The pieces, which are now considered evidence in the case, were taken to the Montreal Museum of Fine Arts.
Police said the suspected thief is a man in his 40s, from Saint-Sauveur, about an hour's drive south of the workshop.
He is scheduled to appear in court Oct. 17 on charges of possession of stolen goods.
The artist's son, Guy Molinari, examined the state of the eight works, the value of which is estimated at $800,000.
The abstract artist died in 2004. He is well known for his use of contrasting colours and geometry in paintings.