The 33-year-old returns to the club where his professional journey began after leaving OGC Nice at the end of his contract this summer.
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Dupe joined Nantes’ academy at the age of 15 and signed his first professional deal in 2012.
Between 2014 and 2019, he made 64 appearances for Les Canaris before moving on to continue his career elsewhere.
The goalkeeper has signed a two-year contract with Nantes, with an option to extend his stay until 2029.
Dupe, who becomes Nantes’ second summer signing following the arrival of Cameroon midfielder Wilitty Younoussa, will be Michel Der Zakarian’s first-choice goalkeeper next term.