Jurgen Klopp's Reds are reportedly chasing Lorient star Guerreiro as they hunt for a new left-back.
Liverpool's chase of Lorient left-back Raphael Guerreiro appears to be becoming more complicated as the Mirror claims the Reds will have to beat off competition from European giants such as Real Madrid and Barcelona for his signature.
Jurgen Klopp and the Reds are both thought to be admirers of the 22-year-old after he enjoyed another superb season in Ligue 1, and speculation has intensified in recent weeks that he is a prime target for the German boss.
Liverpool are in the market for a new left-back, with Alberto Moreno's Europa League final nightmare summing up his inconsistent season, and Joe Gomez having missed almost all of his debut Anfield campaign through injury.
However, the Mirror reports that the Reds will have to battle Real Madrid for this signature of the talented star, with Zinedine Zidane keen on the player as a replacement for Fabio Coentrao and to challenge Marcelo for the starting left-back spot.
That interest from Real adds to the discussions which reportedly have already been held between the players' representatives and Catalan giants Barcelona and Klopp's former side Borussia Dortmund.
Spanish outlet Sport claims that Barca have opened talks over a potential move, while German paper Bild goes as far as to suggest that Dortmund already have an agreement in place which would allow them to sign Guerreiro for £12 million this summer.
Liverpool and Klopp will undoubtedly be nervous of these reports, with the Reds having no European football of any kind to offer to transfer targets, and any potential move to Anfield may hinge on Klopp's powers of persuasion.