"Joining a club of Leeds's stature and having the chance to work under Terry Venables again made it an easy choice for me," Okon said.
"I am very happy and very excited about the move,
"Because of the number of matches to be played I think there is room for everyone.
Most of the teams who are looking to win trophies have big squads and, hopefully, when called upon, I can do my best and play my part."