As per Mundo Deportivo, the three names on the list are Real Betis' Guido Rodriguez, Bayern Munich's Joshua Kimmich and Everton's Amadou Onana, who will be available at wildly different price points.
Betis' Rodriguez is the most likely signing for the Blaugrana due to their economic troubles and their non-compliance with La Liga's salary fair play rules. The midfielder would be available as a free agent and would be on fairly low wages.
Bayern Munich veteran Kimmich sits as the second option due to his vast experience in the pivot position with the Bavarians. The German has always been linked with a move to Catalonia thanks to his development under former Barca coach Pep Guardiola. With his contract set to expire in 2025, Bayern could be forced to sell the 29-year-old this summer for a reported price of close to €35 million (£29.9m/$37.5m) so as to not lose him for free next year.
Onana remains the third option and would be the costliest of the three. His move would require a major sale before coming to fruition. The 22-year-old has received a lot of interest from all across Europe and would cost the Catalans close to or over €100 million (£85.5m/$107.2m).