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Florentin last played for French Ligue 2 club FC Sochaux-Montbeliard where he still had one-year left in the contract.
The Kozhikode-based side lost 1-2 to the team from Bangladesh to be knocked out.
Cornelius Stewart scored the solitary goal in the match played at Kolkata's VYBK Stadium.
The I-League champions ran out 4-2 winners in the clash to two Indian heavyweight clubs in Kolkata.
Hyderabad had won the first leg 3-1 through goals from Bartholomew Ogbeche, Yasir Mohammad and Javier Siverio.
The two teams will go up against each other again on Wednesday for the second leg with ATKMB needing to find the back of the net at least twice to stand a chance of advancing to their second successive summit clash.
Roy Krishna's first-half strike ensured their progress to the semifinals.
The AIFF Disciplinary Committee issued a 'stern warning' to the ATK Mohun Bagan player for his comments made after the Indian Super League match against Kerala Blasters FC last month.
Liston Colaco and Manvir Singh scored in a 2-0 win on Sunday.