Chelsea are shopping in Portugal ahead of the summer market.
O Jogo says the Blues are preparing for life after Eden Hazard and reportedly sent scouts to watch João Félix, Bruno Fernandes and Ruben Dias in Wednesday's Lisbon derby, according to reports.
But Benfica have recently slapped a staggering £105m price tag on Felix, who has been having a breakthrough season.
Chelsea sent scouts to watch the Lisbon derby on Wednesday - won by Benfica 2-1.
The Blues were though to be observing Benfica's Felix and Dias, as well as Sporting's Fernandes - who scored a consolation goal for the Lions in the derby game.