Look at the circled heads in this picture from the 1996/97 season.
Clockwise from top left we've got Barcelona's La Liga winning coach Luis Enrique;
Pep Guardiola, who's just led Bayern Munich to the Bundesliga title;
Jose Mourinho, then Robson's assistant, now a Premier League champion (for the third time) with Chelsea;
And Laurent Blanc of Ligue Un winners PSG.
In fact the only 2014/15 title-winning manager from Europe's top five leagues not in this picture is Juventus boss Massimo Allegri. He was playing for Perugia at the time.
To sum up, Bobby Robson was the Godfather.