According to Spanish media, €9m still divides Udinese and Barcelona in the negotiations for Alexis Sanchez.
The Friuli club has confirmed talks are at an advanced stage and they have the priority despite offers from Napoli and Manchester City.
Newspaper Marca claims Barcelona have proposed €26m, which is well short of the minimum €35m Udinese are looking for.
To help close the gap, the Blaugrana are looking to hand over one or more players as part of the deal.
However, it is proving tricky to find players that both clubs are happy with.
Jonathan Soriano was also linked with Roma, but now seems to be heading for FC Salzburg.
Brazilian talents Henrique and Keirrison are options, but Udinese have rejected Alexander Hleb due to worries over his injury problems.