Barcelona coach Hansi Flick expressed a desire to bring in a new fullback during the summer transfer window, however, due to budget constraints, the club was unable to make the signing.
Sport says, however, Barca do intend to fulfill Flick's wish in 2025, with Santos high on the agenda.
For now, Jules Kounde has filled in at right-back, but Flick would prefer a specialist and Santos fits the bill.
Santos arrived in Ligue 1 just over a year ago from Estoril for €6.5m. His price has since increased, though it still falls within the parameters that the Blaugrana would be willing to pay.