The former AC Milan midfielder was presented to the local media this morning.
Kessie said, "When a player starts playing he never looks back. I reach an important place and I still want to show the things I know how to do.
"I spoke with Ibra (Zlatan Ibrahimovic) and he gave me advice, yes. He told me that it is a good place to come and told me: 'You must do the same as you do here'."
Kessie also confirmed he spoke with Yaya Toure about life at Barca.
"Yaya is a great champion and I was lucky enough to play with him in the national team, he was a very complete player.
"I make myself available to the coach, the position will be decided by him, I am a midfielder, but if I should play in front, behind, to the right or to the left, the coach will tell me."