Born to merchant father Dimitrije and housewife mother Sofija, young Blagoje grew up on the outskirts of Belgrade in 7 Đakovačka Street with his older brother Nikola who was also a footballer.

Ljubomir Vukadinović, columnist in the Serbian newspaper Politica, stated on the basis of which the book, the first about an athlete in Yugoslavia, "1000 goals of Moše Marjanović" (1936), was written in our newspaper on the day of the match, wrote that he is the best Yugoslav footballer since 1928.

During the game, it always seemed that he knew what to do with or without a ball (especially during goalscoring situations in the opponent's penalty box, when he was highly unpredictable and very clever).

He was simply himself, a player of his own style and charm, completely different from all the aces of his predecessors and those who succeeded him.

This blond-haired, strong athlete, whose eyes are gentle and warm, harmless as in a big boy, whose figure in a sports jersey is caressed by thousands of eyes, whose darting rush to the goal stops the breath and accelerates the beating of the heart, whose shot causes a delirium of delight.

He participated in the 1928 Olympic Games in Amsterdam,[8] and in the first FIFA World Cup in Uruguay, in which he helped his nation win a bronze medal.

Many football experts of that time showed great appreciation for "Moša's" skills, including Hugo Meisl (creator and coach of the Austrian "Wunderteam") who claimed that with Marjanović in the attacking line "Wunderteam" would be perfect.

During the German invasion on Yugoslavia, he was captured as a truck driver of the Yugoslav Royal Army and placed in a prison camp in Fürstenberg, Germany.

In the midst of adversity, sometimes they organized football matches between "war prisoners" versus "the guardians".

[16] During his coaching career, he first led Proleter Osijek then OFK Beograd, with whom he won the national cup in 1955.

Also in 1955, Marjanović went on a tour to Asia where he had the honor to meet Chinese People's Leader Mao Zedong.