His debut for PFC Levski Sofia was on 12 March 2006, as a substitute against Marek, replacing Lúcio Wagner in the 75th minute.

According to Marca (newspaper) the 20th year old Borislav Stoychev was the best central defender in Bulgaria and he was dominating in the air game.

His performance is on the highest level and Stoychev gets noticed by one of the best Bulgarian football coaches Petar Hubchev.

November 2012 Stoychev signed for PFC Beroe Stara Zagora a three-year contract.

[10] In 2014, after two very good years in PFC Beroe Stara Zagora, few of the leading football teams in Bulgaria are interested in Borislav Stoychev.

[19] He was called up to the Bulgaria squad by Ivaylo Petev for the UEFA Euro 2016 qualifications against Italy in March 2015 and against Malta in June 2015.