McTominay scored in Napoli's 2-0 Champions League win against Qarabag last night.
And reflecting on the match, Boban told Sky Italia: "Qarabag didn't play badly, but Napoli defended very well, very aggressively, and counter-attacked well.
"Today I saw a mature, serious, and very focused team.
"And they have an extraordinary player, player, who always makes the difference, McTominay. I saw a united Napoli, perhaps like never before this season.
"Everyone ran a lot and sacrificed, Napoli is doing well now and it shows."
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