Barcelona scouts were in the stands for last Sunday's UEFA Youth League final.
Benfica defeated RB Salzburg 6-0 on the day.
Sport says Barca had scouts posted to run a check on a player from each team.
Benfica's Italian midfielder Cher Ndour, who was snapped up from Atalanta, is on Barca's radar.
Also interesting the Catalans is RB Salzburg striker Roko Simic, who boasts a Champions League appearance to his name.