The Japanese star is set to become a Liverpool player when the transfer window reopens in January
Jurgen Klopp opted for the attacking midfielder after being impressed by his performance in the two-leg Champions League encounter between Liverpool and Salzburg.
German coach Rangnick oversees the technical development of Red Bull's sports teams within his role as head of sport for the group, and feels Minamino is another astute buy from Klopp.
"You could see he was good on the ball, very technical, good mentality," Ragnick told Sky Sports.
"He is also like many Japanese players, willing to invest in the team's efforts to win the ball back.
"Of course he had to learn those things tactically, but his willingness and his mentality was already there. He's not the kind of player to say, 'OK the other team has got the ball so, please let me know once we have the ball so I then can take part in the game again'.
"The style [at Salzburg] is very similar to Jurgen's. It's proactive, it's high pressing, counter-pressing. Once we have won the ball we don't want to waste any time by square passes or back passes."
Minamino is the fourth player Jurgen Klopp has signed from the Rangnick production line, with Brendan Rodgers' signing Roberto Firmino who also played for Rangnick at Hoffenheim in 2015.
"It's definitely no coincidence that he has four former players of mine (Firmino, Naby Keita, Sadio Mane and Joel Matip) because it shows that he is, in fact, looking for the same kind of players, with the same assets, with the same mentality as we do.
"And, I think, out of the top clubs in Europe, he's probably the coach with the highest number of former players from us."
"He is also like many Japanese players, willing to invest in the team's efforts to win the ball back.
"Of course he had to learn those things tactically, but his willingness and his mentality was already there. He's not the kind of player to say, 'OK the other team has got the ball so, please let me know once we have the ball so I then can take part in the game again'.
"The style [at Salzburg] is very similar to Jurgen's. It's proactive, it's high pressing, counter-pressing. Once we have won the ball we don't want to waste any time by square passes or back passes."
Minamino is the fourth player Jurgen Klopp has signed from the Rangnick production line, with Brendan Rodgers' signing Roberto Firmino who also played for Rangnick at Hoffenheim in 2015.
"It's definitely no coincidence that he has four former players of mine (Firmino, Naby Keita, Sadio Mane and Joel Matip) because it shows that he is, in fact, looking for the same kind of players, with the same assets, with the same mentality as we do.
"And, I think, out of the top clubs in Europe, he's probably the coach with the highest number of former players from us."