Portguese international full-back Jose Bosingwa will join Chelsea in a deal worth just over £16 million pounds.
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.
Chelsea released a statement saying: "Chelsea Football Club can confirm it has reached an agreement with FC Porto for the transfer of Jose Bosingwa.
"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 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.
Manchester United were rumoured to have made a similar offer for Bosingwa last week, while Chelsea reportedly bid £55 million for Real Madrid full-back Sergio Ramos according to Spanish newspaper El Pais, but the signing of Boswinga represents Avram Grant's third prominent signing since replacing Mourinho as Chelsea manager.
Nicolas Anelka and Branislav Ivanovic joined the Champions League finalists during the January transfer window, and the recruitment of Bosingwa signals the start of Chelsea's planning for next season's assault on the Premier League, two years after they successfully defended their title.
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