Portugal international full-back Bosingwa will join Chelsea in a deal worth just over £16 million. Boswinga, 25, will join former Porto team-mates - and international colleagues - Paulo Ferreiro and Ricardo Carvalho at Stamford Bridge four years after Jose Mourinho brought the defenders to London with him.
"The player is now in England to discuss personal terms and undergo a medical."
Bosingwa became a first-team regular at Porto following Ferreira's move to Chelsea, after Jose Mourinho had signed him from Boavista in 2003.
Born in Kinshasa, in the Democratic Republic of the Congo, Bosingwa has won six caps for Portugal since making his international debut last year.
A statement on Porto's website read: "FC Porto has informed the market it has reached an agreement in principle with Chelsea for the transfer, permanently, of the rights of membership of the sport athlete Jose Bosingwa, at a price of €20.5 million.
"The agreement on this transfer will be formalised once the athlete completes medical examinations, with the consent of FC Porto, Futebol SAD."
