30 september 1976, Lokomtiv Plovdiv played against Red Star Belgrade in the UEFA Cup in Belgrade.

The goalkeeper from Plovdiv, Stancho Bonchev, was replaced during this game. He was replaced by Kurbanov, according to different sources.

Could it be that this is a mistake and that he was replaced by Venko Kamburov ?

Can somebody confirm this or check this ?
And if Kurbanov did indeed replace Bonchev, what was the first name of Kurbanov ?

During the time the topic was locked I received following reply by PM from EithelRuin:

"The first name of Kurbanov is Nikolay (alt. spelling: Nikolai). It is unlikely that he subbed the goalie since he is listed with goals for that season = not a goalie.

Venko Kamburov (7,0) is listed in the squad of 76-77"

Definetely is Venko Kambuv. He is a goalie. Foreign sources badly confuse bulgarian names !!!