Robson gave both coaches their big breaks during his career.
Villas Boas told chelseafc.com: "Bobby was a very important person in my career. He was the person who advised me at a very young age to go on coaching courses and unlocked the doors of Porto for me to have access to his training sessions. We had a very good relationship and he was someone I respected a lot and was respected in world football. He is somebody that means a lot to the English game and I think he would be happy of course.
"What he did he did not only with me and Jose but with all different kinds of people, promoting them and inspiring them to take their own role and their own way. I think he would be extremely happy."