Arsene Wenger's main transfer target during the summer months was the player who has shocked, infuriated and amazed more than any other footballer since he arrived in the Premier League back in January 2011.
Liverpool's Luis Suarez was top of the Arsenal manager's wish-list after making it crystal clear that he no longer wanted to be at Anfield. The Reds may have felt they had given Suarez the world - and in many ways they had - but even they managed to underestimate the ultra-divisive Uruguayan.
In the end, the 26-year-old was forced to stay at Liverpool, and even if he leaves in the future it looks certain that the Merseyside outfit will only consider selling to an overseas club such as Real Madrid.
Wenger must have felt he was capable of taming the supremely-gifted Suarez; he wouldn't have tried to do the deal otherwise.
And the Frenchman, a connoisseur of football from all over the world, will no doubt have been keeping a close eye on another gifted yet temperamental South American striker who would undoubtedly be a superstar – and a menace - in the Premier League.
Not many players have found themselves ahead of Lionel Messi and Cristiano Ronaldo in the race for the Pichichi in recent seasons, especially after two full months of action.
But Atlético Madrid's Brazilian – or should that be Spanish? – striker Diego Costa currently leads the way in the La Liga top scorer charts after netting a hugely-impressive 10 goals from his first eight league appearances.
The 25-year-old has flourished since the departure of the prolific Radamel Falcao, who Atlético supporters have not even had the chance to miss at the start of this season thanks to Costa's incredible displays.
But as well as being an excellent footballer, like Suarez he also comes with a lot of baggage.
Winding up opponents, constant diving, committing needless and sometimes downright dangerous challenges – it's as if Costa read Suarez's rulebook on how to be an absolute git of a striker.
But just ask Diego Simeone if he's worth the hassle. He'll give you the exact same answer Brendan Rodgers would if discussing Suarez.
So, Wenger must ask himself whether or not it's worth taking a gamble on signing the new Suarez.
It would no doubt be an expensive gamble – but Wenger needs another striker, and it could pay off more than if he signed the out-of-form Karim Benzema, who has only scored two goals in eight league appearances for Los Blancos this season and has a tendency to go missing in the biggest matches.
Benzema is the safe option – and the one that would appeal most to supporters – but no manager ever won trophies without taking a few calculated risks.