Barcelona President Josep Maria Bartomeu has said Lionel Messi will become the world's highest paid footballer.

Bartomeu said talks were on-going with the player's father and principal agent Jorge Horacio Messi over a deal that would surpass the five-year contract Cristiano Ronaldo signed with Real Madrid in September last year.

"We are in the midst of the season, so it is not the moment to be negotiating with him, but it is the moment to talk to the agents and with his father and that is what we are doing," Bartomeu said.

"We will talk with them about how we see the player. He is our star and he has a contract until 2018 because we want him to participate in our future, but there is the will within the club that he becomes the best paid player in the world.

"He is the number one and deserves to be the best paid player in the world."