Ralf Rangnick described Liverpool's evolution under "Jurgen Klopp" as "not a coincidence" - because he was involved in developing many of their key skills in his personal career.
The caretaker Manchester United manager says the future ahead of the season is uncertain and could point to a number of Liverpool players who have played a key role in their careers.
Rangnick, 63, has been hailed as one of the best tactics in football, having recruited Naby Keita, Ibrahima Konate, Sadio Mane and Takumi Minamino during his time with the Red Bulls, including RB Leipzig and Salzburg. .
Earlier, Hoffenheim had signed Roberto Firmino from Figueirense and had to leave within weeks of the deal, but Rangnic coached Joel Matip at Schalke and Schalke.
It should be noted that Rangnic has taken charge of Liverpool's toughest opponent in the Premier League on Tuesday.
"They are good, they are very good. It's no coincidence that they are as good as them," Rangnic told Liverpool.
"Jargin built this team about six and a half years ago. Six or seven of those players are my players."
With Klopp's Liverpool playing a high-speed game similar to those of Rangipick Leipzig and Salzburg, the resulting players are a natural fit for Klopp's Reds.
"When no one knew them, we signed for the club, and it is no coincidence that our former club may have the largest number of players," said Rangnic.
"Their approach, their style of football, the way they want to play is very similar.
Rangnick United United moved to fifth in the Premier League on Saturday thanks to a hat-trick from Cristiano Ronaldo's 3-2 win over Norwich City in the Premier League on Saturday.
However, Rangnic warned that the treble would document some major cracks and that much-needed improvement would later be needed to compete with Liverpool.
"United have been frustrated at times, especially in defense, and Rangnic said:" The reason why the club contacted me in November was that they conceded so many goals easily.
"We reduced the number of goals we conceded, but our defense helped us to be in the top four. This is not the standard we need. "