|Full name||João Alexandre Duarte Ferreira Fernandes|
|Date of birth||31 December 1979|
|Place of birth||Lisbon, Portugal|
|Height||1.76 m (5 ft 9 1⁄2 in)|
|2007||→ Konyaspor (loan)||31||(8)|
|* Senior club appearances and goals counted for the domestic league only and correct as of 2 April 2017.
He amassed Primeira Liga totals of 225 games and 29 goals over the course of 12 seasons, representing in the competition Belenenses, Vitória de Guimarães, Marítimo and Vitória de Setúbal. He also competed professionally in Turkey.
Born in Lisbon, Neca started playing professionally for local C.F. Os Belenenses, being a starter from an early age. In the 2005–06 season he moved to fellow Primeira Liga club Vitória S.C. and, although he was an important first team member, the Guimarães-based team was relegated.
In the summer of 2006, Neca signed for C.S. Marítimo on a Bosman transfer. However, after limited play, he was loaned out to Turkish side Konyaspor in January 2007. He was definitely released by the Madeirans in December but stayed in Turkey, switching to Ankaraspor.
In late December 2009, Neca agreed on a return to his country, signing with struggling Vitória F.C. until the end of the campaign and contributing with 11 games and two goals as the Sadinos eventually escaped relegation. In the 2012 summer, at nearly 33, he returned to Konyaspor, with the club now in the second division.
Neca represented Portugal at both the 1999 FIFA World Youth Championship and the 2002 UEFA European Under-21 Championship. In 2002, courtesy of his consistent performances at Belenenses, he earned two full caps.
- Neca – FIFA competition record
- "Sílvio é o 14.º a estrear-se com Agostinho Oliveira" [Sílvio is debutant number 14 with Agostinho Oliveira]. Record (in Portuguese). 7 September 2010. Retrieved 10 June 2015.