Barcelona are locked in talks with Sporting Lisbon for teenage pair Edgar and Agostinho Ca.
Barca hope to use their relationship established during the sale of Jeffren Suarez to Benfica to clinch a deal for the pair.
However, with super agent Jorge Mendes having just added Edgar and Agostinho Ca to his stable, there is concerns that Real Madrid could step in to trump Barca.
Narcis Julia, who is driving the deal for Barca, have also asked Sporting about Rafael Veloso, Joao Figueiredo Mario and Tobias.