Barcelona hopes to avoid a repeat of the Neymar situation last summer when Paris Saint-Germain triggered his buyout clause.

Barcelona have begun to increase the release clause in some of their players' contracts.

Lionel Messi's buyout price is now €700 million, while Gerard Pique and Sergio Roberto would cost €500 million apiece.

"I would like to say it's going to stay [at the current level] but I am not sure," Josep Maria Bartomeu said when asked whether the cost of players would continue to spiral.

"Because, all the time, more and more clubs are belonging to very rich people or to states who are investing a lot of money in football, and this money comes to the clubs.

"We try to keep our players, we don't want to sell. I hope that next summer nobody will come to buy our best players."

Barcelona wants to keep their current squad in place.

"We don't want to sell," he added. "We are a club that want to have good football, we like to practice [the] unique football that we play, and Messi is key player.

"But the more important thing is he doesn't want to leave. He likes the city, it's his club, he came from Argentina at 12. You can have as many clauses as you want, but if a player doesn't want to leave he will stay.

"Andres Iniesta is an example. We want him here not as a player, but as a legend in the future, and with Messi I hope it's the same.

"Now he's got a four-year contract, but I don't think it will be his last."