With the Catalans embroiled in financial ruin, due to their debt which stands at more than £1billion, the club were forced to resort to the free agent market with the signings of Sergio Aguero, Memphis Depay and Eric Garcia this summer.
The Sun says the Blaugrana will likely have to repeat their dip in the bargain bin next year and have identified Azpilicueta and Christensen as possible freebies.
But the LaLiga giants' plans could stall before they ever get going.
Both defenders are key members of Thomas Tuchel's squad and the club could make a move to tie them down with the offer of new contracts before the end of the season.
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