Career
Born in Plovdiv, Mastagarkov is a product of Lokomotiv"s youth system. He made his debut during the 2010-2011 season on 19 September 2010 in a 0–3 away loss against Lokomotiv Sofia, coming on as a substitute for Dragi Kotsev.
Born in Plovdiv, Mastagarkov is a product of Lokomotiv"s youth system. He made his debut during the 2010-2011 season on 19 September 2010 in a 0–3 away loss against Lokomotiv Sofia, coming on as a substitute for Dragi Kotsev.
