The 24-year old Ivory Coast striker has joined the Swans for a record fee of £12million and is eagerly anticipating life in the Premier League following his 31-goal season in Holland.
"This move has been talked about for quite some time, so I am delighted it is all completed," he said.
"Now it is important that I focus my mind on the challenge ahead because I hope to make the Swansea fans very happy.
"The Europa League is my first focus. I enjoy playing in Europe; I am used to it.
"I am looking forward to joining the training camp out here in Holland as a Swansea player and building up good communications with the team and coaching staff as quickly as possible."