|Full name||Mário João Sousa Alves|
|Date of birth||6 June 1935|
|Place of birth||Barreiro, Portugal|
|Height||1.69 m (5 ft 6 1⁄2 in)|
|Playing position||Full back|
|* Senior club appearances and goals counted for the domestic league only.
He appeared in 166 Primeira Liga games during ten seasons, scoring 11 goals.
Born in Barreiro, Setúbal District, Mário João started and finished his 14-year senior career with G.D. CUF, beginning as a forward. In between, he spent seven years with S.L. Benfica in the Primeira Liga, appearing in 89 competitive matches and winning six major titles, including both of the European Cup finals in the early 60's, against FC Barcelona and Real Madrid.
- "Nº131 – Mário João" (in Portuguese). Vedeta ou Marreta?. 10 October 2008. Retrieved 7 October 2009.