Red Bull football chief Ralf Rangnick has no doubts about the quality of RB Salzburg attacker Takumi Minamino.
The Japan international is set to join Liverpool in January after they activated a £7.25 million release clause in his contract.
"You could see he was good on the ball, very technical, good mentality," Rangnick 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'.
"Even at the age of 19 you could see he was a good boy."
"The style [at Salzburg] is very similar to Jurgen's," Rangnick added. "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.
"We are trying to play forward as quickly as possible, trying to create chances, trying to score as many goals as possible."