Liverpool are undoubtedly laughing at the fact that they spent just £8.5 million to bring Philippe Coutinho to Anfield.
While the 24-year-old made a modest start to life on Merseyside, scoring five Premier League goals in his first season, the Brazil international has gone on to be the envy of clubs across Europe.
Under the guidance of Jurgen Klopp, the midfielder has already scored five goals in his first 11 Premier League appearances of this campaign, to equal the tally of his first season in England.
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But while Inter Milan will be looking back at the sale of Coutinho thinking about how much more they should have sold their then highly-rated young star for, Liverpool fans are salivating of what Coutinho and his teammates can achieve this season.
The midfielder's 30th-minute goal against Watford not only helped Klopp's men well on their way to a comfortable 6-1 victory, but sent out a warning to the rest of the Premier League's big guns: we are serious title challengers.
Alongside compatriot Roberto Firmino and Sadio Mane, Coutinho's form has been exemplary and has been the key man in Liverpool's fine start to the campaign.
The fact that the 24-year-old has been so vital to the Reds this campaign has been reflected in his consistently top class performances.
It seems a long time since Coutinho's stunning first-half free-kick that put Liverpool back in the game and on their way to a win at Arsenal, on the opening day of the season. But since then, the former Inter midfielder has gone on to further prove exactly why Barcelona are interested in Liverpool's star man.
And there is no doubt that former Liverpool defender Jamie Carragher has been wowed by Coutinho's excellence so far this season, tweeting: "Anyone playing better than Coutinho in @premierleague".
But while the Liverpool legend, alongside the club's fans, has been hugely impressed by Coutinho's outstanding performances this campaign, some fans were inclined to question Carragher on Twitter.
Asides from the hilarious and sarcastic tweets, fans were clearly signing from the same hymn sheet. No doubt much to the disappointment of Carragher.
Back on form
Eden Hazard, too, has re-found the form that deserted him for the entirety of last campaign; having already netted seven goals in 11 league appearances this season - with the Belgian putting in a top class display in Chelsea's 5-0 demolition of Everton on Saturday.
However, while Coutinho may be marginally behind the Chelsea star in the Premier League scoring charts, there is no doubting the Brazilian's impact on Klopp's team, who currently top the Premier League - a point ahead of Chelsea.
Has Philippe Coutinho been the top performer in the Premier League so far this season? Have your say in the comment box below.