Kelvin Mateus de Oliveira
|Full name||Kelvin Mateus de Oliveira|
|Date of birth||1 June 1993|
|Place of birth||Curitiba, Brazil|
|Height||Script error: No such module "convert".|
|Palmeiras (on loan from Porto)|
|2011–2012||→ Rio Ave (loan)||22||(0)|
|2015–||→ Palmeiras (loan)||2||(0)|
As teammate Christian Atsu, Kelvin was sent on loan to fellow top division side Rio Ave F.C. for the 2011–12 campaign. He made his debut in the competition on 21 August 2011, in a 0–1 away loss against Académica de Coimbra.
Kelvin returned to Porto for 2012–13, spending most of the season with the B-team in the second division. He managed to score, however, three important goals for the main squad as a substitute, helping to home wins against S.C. Braga (3–1) and S.L. Benfica (2–1), the latter coming in the 92st minute.
- Plantel já está concentrado no Olival (Roster joins at Olival); A Bola, 30 June 2011 Invalid language code.
- Kelvin foi o MVP na vitória sobre o SC Braga (Kelvin the MVP in win over SC Braga); Porto's official website, 8 April 2013 Invalid language code.
- FC Porto 2–1 Benfica tactical breakdown; PortuGOAL, 11 May 2013
- "Rui Águas e Kelvin: eles contam como se decide um Clássico" [Rui Águas and Kelvin: they will tell you how to decide a classic] (in Portuguese). Mais Futebol. 23 April 2015. Retrieved 29 May 2015.
- "Palmeiras acerta com atacante Kelvin por uma temporada" [Palmeiras agrees with forward Kelvin for one season] (in Portuguese). Palmeiras' official website. 13 January 2015. Retrieved 13 January 2015.