Kessie's free transfer from AC Milan was confirmed by Barca today.
Toure told Mundo Deportivo: "It's true that I called him during the negotiations with Barça... How do you know? (laughs). We have been in contact this time and he called me several times because he knew that I knew Barcelona.
"To be honest, we talked for days because he wanted to know everything that would be found here. Milan offered him a new contract and it is a great club too, but Barcelona was determined. I told him not to hesitate, that if he wanted to leave he had to go to Barcelona. I explained many things to him in detail and that he had to play well from the beginning, have a good attitude and be as focused as possible.
Toure also said: "Physically he is a very powerful midfielder and I think he can still improve a lot in several aspects. He is a great player and if he has the confidence that he had at Milan I think he will be a great signing. I also told him that he had to be prepared for the high level of competition at Barça, because there are two or three players with whom to fight for a starting position.
"He is fully aware and he has me almost like an older brother, he listens to me a lot. Now he will be in a top club, surrounded by great players. I am very happy for him and for Barcelona."