De Visser now works for Chelsea owner Roman Abramovich and aids technical chief Frank Arnesen in his scouting.
Last week De Visser revealed a little more about the influence of the Dutch faction at Chelsea in an interview with Dutch magazine, Voetbal International.
"It is not an official, sealed partnership between Chelsea and PSV Eindhoven," said De Visser. "It is not the relationship between the two clubs but a relationship between Abramovich and PSV Eindhoven.
"That bond is very, very good. He (Abramovich) has been over to Holland a couple of times and he is totally besotted with the youth academy at PSV. He has had a good look around. He has seen what he wanted to see. This is why he is now building a massive youth academy on Chelsea?s training grounds.
"I know why he is doing this. He is fed up that he keeps having to open his wallet and spend millions on new players. There comes a stage where you think it is pointless to spend so much, especially when it concerns players that Chelsea could develop within their own system or within their own youth academy.
"Mr Abramovich is fed up that he has to keep paying millions and millions for big star players. He had to pay an absolute fortune to get players like Didier Drogba and Michael Essien. This is why he has asked me as a private scout to look out for top class young players who will be the Chelsea stars in three years' time.
"In the meantime, we have to bring them on board and make sure they can develop as footballers away from Chelsea, in a different surrounding. PSV Eindhoven and Chelsea both benefit from my work."
Among players discovered by De Visser and believed to be linked to Chelsea while playing for PSV is one of the biggest names in Dutch football, Brazilian centre half Alex.
His fellow Brazilian, defender Alcides, who last week moved from Benfica to PSV, is described by UEFA as being "owned by Chelsea" and on a "long-term loan" to PSV Eindhoven.
De Visser says: "Alcides is now 21 and I have brought him to Europe. We have put him into the PSV Eindhoven first team this winter."
Jeffersen Farfan, the 22-year-old Peruvian, is another De Visser discovery who has scored 13 goals in 21 games so far this season. While Chelsea say they have no option on him, a move to a Premiership club this summer seem likely.