Ousmane Dembele could be squeezed out of Barcelona if a deal is done for Atletico Madrid attacker Antoine Griezmann.
Griezmann is expected to join Barca this summer when the Catalans meet his €100m buyout clause - with Dembele the prime candidate to make way.
Don Balon says European rivals are well aware of Dembele's situation and are already in contact with his representatives to register their interest.
Atletico coach Diego Simeone would be happy to sign the French attacker as a direct replacement for Griezmann, but isn't alone.
Arsenal are also watching developments, where chief scout Sven Mislintat signed Dembele for Borussia Dortmund. And Liverpool boss Jurgen Klopp is another ready to pounce.
Klopp was beaten by Mislintat to Dembele's signing when he was still with Rennes, with the player admitting having spoken directly with the Reds manager before ultimately choosing BVB 18 months ago.