Barcelona made three bids for Coutinho but set Liverpool a deadline of 7pm last night to accept an offer.
And they have now moved on to target former Real Madrid midfielder Di Maria, according to Guillem Balague.
Barca also remain interested in Ousmane Dembele, whose transfer could be completed in a matter of hours, and Nice midfielder Jean Seri.
Barcelona have been flushed with £198m from the sale of Neymar to PSG and they are desperately trying to get their team up to speed.
They hope to sign Dembele from Dortmund in a deal worth over £100m and are now exploring the possibility of signing Di Maria.
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PSG are ready to offload a number of players after signing Neymar and with Kylian Mbappe on their radar.
And they may be willing to sell Di Maria to Barca despite refusing to sell Marco Verratti to them earlier in the summer.
Di Maria, 29, has started all three Ligue 1 games so far this term picking up one assist.
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Angel Di Maria could be allowed to leave PSG after the signing of Neymar
Neymar scored a double on his home debut this weekend taking his tally to three in two.
Di Maria has struggled in Paris after also finding life difficult in London but Barcelona seem to believe he can recapture his form from Madrid back in Spain.
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