Career
He comes directly from Litex"s youth academy. He made his league debut on 31 May 2009, again as a substitute replacing Wilfried Niflore, as Litex beat CSKA Sofia 1–0. Tsvetkov became a first-team regular early in the 2012-2013 season.
On 7 October 2011, Tsvetkov earned his first cap for Bulgaria in the 0–3 away loss against Ukraine in an exhibition match.