BARCELONA spy Robert Fernandez and two AC Milan chiefs were spotted at Stamford Bridge on Sunday for Chelsea vs Manchester United.
The La Liga giants have recently been linked with Man United duo Ander Herrera and Anthony Martial, according to reports in Europe.
Meanwhile, Milan bosses have considered a swoop for under-pressure Chelsea boss Antonio Conte.
Barcelona spy Fernandez was alongside scout Urbano Ortega for the clash – won 1-0 by the Blues.
In recent weeks, both Martial and Herrera have emerged as transfer targets for the Catalan giants.
Herrera started and played the full 90 minutes of the game in West London – but failed to have an impact on the game.
However, he is being tipped to become the long-term successor to the void set to be left by Andres Iniesta when he eventually hangs up his boots.
Meanwhile, Martial was once again introduced by Jose Mourinho off the bench.
While the French star has thrived as an impact player this season – scoring four times off the bench including the winner against Tottenham – but failed to change the course of the game.
Earlier in the game, Conte’s men dominated but only walked away with a 1-0 victory, as Alvaro Morata nodded home from Cesar Azpiliceta’s cross.
AC Milan have been targeting the homesick Blues chief in recent months as they look to steal him away from the Premier League.
However, Conte reassured Chelsea fans saying: “Milan? Leave it out…
“We’re trying to stay concentrated, because it’s a tough run from here to the end of the season.
“I am only concentrated on Chelsea and purely want to do what is best for Chelsea.
“If we have this enthusiasm, we can fight to the end.”