When Roberto Firmino arrived at Liverpool in the summer of 2015 for £29 million, fans were sceptical about whether the Reds were about to realise they had spent big, once again, on another player who would fail to live up to expectation.
Mario Balotelli is the leading example of a signing Liverpool spent big on and failed to deliver during his miserable, and short, spell at Anfield.
However, despite a steady start to life at Anfield under previous boss Brendan Rodgers, who brought him to the club just months before his departure, the Brazil international has reached a new level under Jurgen Klopp.
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In fact, it seems the duo were made for each other, with Firmino admitting to the Daily Mail, that their friendship is "crystal clear".
Firmino's time in Bundesliga saw him and Klopp come head-to-head on numerous occasions, as the forward's Hoffenheim came up against Borussia Dortmund, and the Brazilian knows exactly what Klopp's style of play is all about, which has significantly helped him to develop quickly under the German's guidance at Anfield.
"I played against his teams for four-and-a-half years." said Firmino. "I know what he wants from a player."
But it's not just his understanding of Klopp's tactics and style of play that have made him a highly-valuable player for the Reds, since the Germans arrival. It is clear that the player and manager's relationship is helping him to flourish and settle nicely in his, still, relatively new surroundings.
Firmino admitted: "When I heard that he was coming to be Liverpool manager, I was so pleased. I could not have been happier.
"I knew what he was going to bring here. He brought a style of work and play from Germany and the team has adapted to it. Our friendship is crystal clear. There is nothing behind it. He is a great person. If you do what he asks you to do, you will never let him down."
In fact, the player is so satisfied with life at Anfield, having opened his Premier League account with a double at home to Premier League champions Leicester City on Saturday, Firmino has hinted he has his ambitions set very high.
"Can he make me the Neymar of Liverpool? It all depends on me."
But while it may be a while yet before Firmino is competing on his Brazil teammate's level, he and compatriot Philippe Coutinho are two vital cogs in Klopp's aim to return Liverpool to the Champions League.
Can Roberto Firmino guide Liverpool back into the Champions League? Have your say in the comment box below.