The 25-year-old has agreed terms on a two-year deal, and has spoken of his delight on completing a move to the KC Stadium.
“I am so happy to have signed for Hull City, and I am very grateful for the opportunity," he said.
"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.
“I was delighted when the call came through. I had a very good feeling from the manager, that he really wanted me to come to Hull. That feeling was mutual.
“I am excited to get started in the Premier League. It is a league that I’ve watched closely, and I know all about it. I’m looking forward to the challenge, and I aim to score many goals.”
Sagbo will travel with the squad to tomorrow’s pre-season fixture at Birmingham City, but will not feature in the game.