Central midfielder Guillaume Gillet moved to Olympiakos from Nantes, the official website of the Greek club.
In this case, no details of the transition of the 33-year-old Belgian are not disclosed.
"The process of my transition to Olympiakos has dragged on, so now I'm very glad to finally be here," said Gilles.
Previously, President Nantes Waldemar Keith insisted that Gilles, who was the captain of the Canaries last season, will not leave the club this summer. Nevertheless, the player himself continued to instruct on the care and as a result he was not detained.
Having joined Nantes in January 2016, Gilles spent 63 matches in the club for all the tournaments.