The Tigers had reached an agreement with the French club back in January, but allowed the player to remain in Ligue 2 to gain further experience before making the move to England.
The 22-year-old centre-back was delighted to have made the switch to the Premier League, when he spoke to the club's official website earlier.
"Hull City stayed in the top division and that is a brilliant thing," he said.
"My team in France won promotion to the top league for the first time as well, so the ending to the season was the best I could have hoped for. I was very happy.
"Now I have come to Hull and it has always been my dream to play in England. I've been playing football since I was ten-years-old and during that time, England has always had the best league in the world and everybody wants to play here.
"I have worked and worked and worked, but I still didn't think the chance would come so quickly. This is a dream come true and I now have the opportunity that a lot of players in France want.
"I can't wait for the new season to start now. I can tell this club is like a family where everybody works hard for each other. I like that mentality."
It's been a busy day for the Tigers on the transfer front, as the club also released eight players, including veteran cult hero Dean Windass and former Leeds United striker Michael Bridges.
Zack Wilson, Goal.com