|Full name||Kostadin Hristov Dyakov|
|Date of birth||22 August 1985|
|Place of birth||Plovdiv, Bulgaria|
|Height||1.77 m (5 ft 10 in)|
|Playing position||Defensive Midfielder|
|2005||→ Vihren Sandanski (loan)||6||(0)|
|2005–2007||→ Rodopa Smolyan (loan)||36||(1)|
|* Senior club appearances and goals counted for the domestic league only and correct as of 26 May 2018|
He was raised in Levski Sofia's youth teams. After that he played as a loaned footballer for Vihren Sandanski and Rodopa Smolyan. He signed than with Chernomorets Burgas in June 2007 on free transfer from Levski Sofia and joined on 8 October 2009 for a trial to FC Schalke 04.
- Rodopa Smolyan 2005/2006 – Eufo.de
- Chernomorets Burgas 2007/2008 – Eufo.de
- "Костадин Дяков подписа с Монтана" (in Bulgarian). novsport.com. 14 July 2016.
- "Монтана се раздели с Даниел Гаджев, последва го и Коце Дяков" (in Bulgarian). topsport.bg. 21 June 2017.
- "Марица с топ трансфер! Привлече бивше канарче от ерата Цветан Василев" (in Bulgarian). plovdivderby.com. 5 September 2017.
- Schalke testet bulgarische Gastspieler
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