Manchester United hero Gary Neville has admitted painful to watch how his bitter rivals Liverpool have progressed under Jurgen Klopp.
Liverpool are currently the only team in the Premier League who still have 100 per cent record after they secured a 3-1 win over Arsenal on Saturday.
And it was Klopp's attacking trio of Mohamed Salah, Roberto Firmino and Sadio Mane were once again to help the Reds take all three points at Anfield.
For Neville the development of these three players since they made the move to Merseyside is agonising.
"Liverpool has signed three £ 30million strikers and turned them into £ 150m strikers, each one of them," Neville told Sky Sports.
"They weren't that good, now they're outstanding.
"This is a really good team, and a painful one for me to watch personally."
Salah almost joined Liverpool back in 2014 but instead signed for Chelsea, however, after failing to establish himself under then Blues boss Jose Mourinho, the Egyptian was then loaned out to Italian side, who then made the move permanent in 2016.
During his spell in Italy Salah rediscovered his form as he scored 34 goals and created 23 assists in 83 appearances.
Liverpool then signed the winger in the summer of 2017 for £ 34m and since then Salah thrived under the management of Klopp, as he has gone on a score 74 goals and 30 assists in 109 appearances in all competitions for the Reds.
Firmino made the move to Anfield in 2015 when Liverpool paid Hoffenheim £ 29 for the Brazilian and during his time with the Reds he has 67 goals and 49 assists in 197 appearances in all competitions.
As for Mane, he joined Liverpool from Southampton for £ 34m in 2016.
The Senegal winger had scored 21 goals in 67 Premier League appearances for the Saints after joining for £ 10m from Salzburg in 2014.
However, like Salah and Firmino, the 27-year-old has flourished under the guidance of Klopp and currently has 46 goals in 95 Premier League appearances for the Reds.
Mane produced a career-best return last season when he finished on 22 league goals, equaling team-mate Salah and Arsenal striker Pierre-Emerick Aubameyang.
It was Salah who stole the show at Anfield on Saturday.
His movement in the box saw Arsenal defender David Luiz grab his shirt to win the ball home into the bottom corner.