The 29-year-old Brazilian has already agreed personal terms with Benfica, while agent fees have also been settled.
However, Benfica president Luís Filipe Vieira wants to close the deal for just €1m, below Boavista’s asking price.
Benfica’s reluctance to raise their bid has given hope to other suitors for the talented Helton Leite.
Boavista had given priority to Benfica but with the player entering the final year of his contract, have grown impatient.
The Primeira Liga side won’t let talks with Benfica drag on for much longer and intend to conclude negotiations quickly.