Julio Llorente admits interest is arriving for the young Spaniard.
"There are some clubs that are waiting for Marcos and we are listening [to their offers], but for now we haven't decided anything," Llorente told Radio MARCA.
"Something on Marcos' future will be surely decided in the next 10 to 15 days.
"There are many options available and it is true that Atletico Madrid are one of the clubs [interested] and one of the options Marcos may have for the future.
"Atletico are a club that already have a history in our family as his father and grandfather played [there]."