The French club had earlier revealed that a deal had been agreed with Hull and Sagbo has joined on a two-year-deal for an undisclosed fee.
Sagbo is keen to prove his worth to the Tigers as they prepare for their return to the Premier League.
"I am so happy to have signed for Hull City, and I am very grateful for the opportunity," Sagbo told his new club's official website.
"I can't wait to get going, and I look forward to meeting my new team-mates this weekend.
"I want to show the coaches and the fans what I'm all about, but not just with my physical presence. I also hope that my mobility and technical skills can add to what is already a good footballing team."
Hull have been busy in the transfer market this summer as they have also signed George Boyd, Maynor Figueroa, Curtis Davies, Ahmed Elmohamady, Allan McGregor and Steve Harper.