The former Barcelona academy star is considering leaving Portugal in January and clubs have been put on red alert.
The Spaniard has previously been linked with a return to the Nou Camp but, according to Jornal de Noticias, Napoli and Tottenham are the clubs in for him now.
Both clubs are currently keeping an eye on a number of left-backs as they may need to dip into the market in January to buy one.
Napoli's first choice in that position, Faouzi Ghoulam, is out injured due to a serious knee injury and they want reinforcements there.