The agent of Dani Alves' is claiming that big clubs are after the right-back, with Chelsea thought to be keeping close tabs on his progress.
The flashy 27-year-old defender has failed to agree terms on a new contract at the Camp Nou - although talks are thought to be continuing between the club and his representatives.
His current deal with the Catalan club is set to expire in June 2012 and Premier League champions Chelsea are rumoured to be preparing an offer for the Brazilian.
Joaquin Macanas wants Barca to give the player a contract that he believes represents his importance to the club, but admits other top sides, including Chelsea, are monitoring his situation closely.
"Dani is one of the best defenders in the world and the big clubs desire his services," he was reported as saying in the Spanish media.
"We only ask that Barca value him in reality for his work and development during these years."
Alves would command a high fee, and it is thought Primera Liga champions Barcelona would accept no lower than £26 million.
Chelsea are keen on a new right-back with the future's of Portuguese contingent Paulo Ferriera and Jose Bosingwa uncertain. The Stamford Bridge outfit would reportedly offer him a four-year contract if any deal is done.