[1] In autumn 1905, Nikolov was, along with Ali Sami Yen, among the thirteen founders of Galatasaray.

However, the original list with Nikolov's name on it was reinstated after the foundation of the modern Republic of Turkey by Mustafa Kemal Atatürk in 1923.

[2] The signature of one Boris Nikolov stands on the second copy of Bulgarian football club PFC Slavia Sofia's record of foundation from the early 1930s, reconfirming the club's original establishment in 1913.

An article from the Bulgarian-language sports portal Sportal.bg theorizes about this Boris Nikolov being the same person as the co-founder, first manager and first captain of Galatasaray.

The article recognizes the lack of any further evidence, other than the fact that multiple Bulgarian footballers returned to that country from Istanbul as the Balkan Wars began and were members of the pioneering football teams of Sofia.