Benfica start Jankauskas talks
Jankauskas is currently on loan at Estadio da Luz from Real Sociedad and has been in prolific form for the Portuguese giants.
The Lithuanian international arrived at Benfica at the turn of the year and has scored eight goals in ten appearances.
At the weekend he made a stunning impact as a substitute in the Lisbon derby, scoring a minute after entering the fray, although Jardel's last gasp equaliser for Sporting dampened the celebrations.
Real Sociedad are willing to offload the 27-year-old permanently but will not budge from their é¼3 million asking price.
Benfica have until the end of June to exercise their purchase option on Jankauskas and given his sparkling displays, they will be keen to raise the funds to finance the transfer.