The Nigeria international, 26, has signed a three-year contract with the Cottagers.
"I'm looking forward to meeting up with my new team-mates over the next few days, settling down and preparing for the club's next home game against Bolton Wanderers in a few weeks' time.
"This is a crucial stage in my career and I'm delighted to have committed myself to Fulham for what I hope will be my prime years as a professional footballer.
"There is serious competition for places in the middle of the park at Fulham but I've joined to establish myself as a first-team player. Now I aim to get my head down, work hard and prove to the manager that I deserve a place in his starting XI. "