Born in Lisbon, Paulo Sérgio started his career at local Sporting Clube de Portugal, but never appeared in the Primeira Liga with the first team.
In the 2009 summer, Paulo Sérgio returned to his country and Algarve, signing for S.C. Olhanense who had just recently promoted to the top flight and being regularly played over the course of two seasons as the club managed to consecutively retain its division status.