According to AS, Pellegrini is keen to take the Paraguayan along with Newcastle defender Federico Fernandez .
The Chilean boss is believed to have made his former Hammers signing a top target as he bids to beef up his defensive options.
Balbuena and his advisors have made it clear for weeks that the central defender is set to leave the Irons and a move to Spain and reunion with his former boss now seems to be very much on the cards.
The club want the deals sorted out quickly as they are set to lose a couple of players in the window,
Both Balbuena and Fernandez are free agents this summer and are very much priority targets for the Spanish club.