Goncalves was heavily involved in negotiations getting Villas-Boas his exit from Porto.
"It's official. Andre Villas Boas signed a contract for three seasons with Chelsea. Above all, I am pleased that he has taken this big step in his career. It is a situation that he craved," said the agent.
"It was a transfer that was made in front of everyone and this is important.
"It is a return to a place that he knows well, but with a responsibility that was completely different when he was last there. He has the ambition to achieve big things."