Liverpool defender Dejan Lovren believes their 4-3 win over Borussia Dortmund in the 2016 Europa League quarterfinals was the start of their evolution under manager Jurgen Klopp.
The Reds have regained their spot on Europe's top clubs' dining table in recent seasons, with last season's Champions League victory the pinnacle of their ascendency.
They also came close to lifting the Premier League last season, but fall short thanks to Manchester City's brilliance.
Their success has mainly been engineered by the German coach, and Lovren believes that their come-from-behind victory over his former side was a key marker.
The two sides were tied at 1-1 from the first leg in Germany, leaving all to play for at Anfield.
The visitors shocked the home crowd with two quick goals in the opening 10 minutes through Henrik Mikhtaryan, but Divock Origi pulled one back to halve the scores.
Borussia restored their two-goal cushion through Marco Reus before Liverpool leveled through Phillipe Coutinho and Mamadou Sakho.
Lovren then won it at the death, sending the home crowd into a delirium.
“A lot has changed, to be honest, from four years ago,” said the center-back in an interview with the club's official website.
“That was one of the key moments for us for the progressive mood. We started to play almost every final – maybe we didn’t win it – but we really raised the bar after that.
“It was a positive thing that we had this game and after that, it happened again: Barcelona. We learned a lot, we grew a lot as a team. Of course, there has been some changes but the core of the team always stayed there.”
The Reds would experience another magical night at Anfield en route to their Champions League victory last season when they beat Barcelona 4-0 to overturn a 3-0 deficit from the first leg defeat in Barcelona.