Former Barcelona forward Rivaldo has made clear that he thinks Sergio Ramos would be a good signing for the Blaugrana.
The Real Madrid captain's contract comes to an end on June 30 and he has not yet agreed a new deal with Los Blancos.
"A player has to be professional, and if you have good offers, I don't think it's okay to hear them," Rivaldo told Betfair.
"Of course, Sergio Ramos would be a good signing for Barcelona. It would be historic and it would be controversial because of Sergio Ramos' history with Real Madrid."
Another player who will be a free agent this summer is Lionel Messi, who has been strongly linked with Paris Saint-Germain.
However, Rivaldo believes that Mauricio Pochettino should strengthen in other areas.
"If I were Pochettino, I would tell the PSG owner that we'd better stay as we are before bringing in Messi," Rivaldo noted.
"But football is also business."