After an unproductive World Cup campaign in which he didn't score a single goal for Spain, many questioned whether Diego Costa would live up to the expectations of the Stamford Bridge crowd.
Many people - most notably former Liverpool and Manchester City midfielder Dietmar Hamann - predicted that Costa - who cost Chelsea £32 million - would follow a similar path to fellow Spanish striker Fernando Torres and turn out to be an expensive flop.
Costa, however, has proved his doubters wrong. Not only has he been in scintillating form; but he offers something to the Chelsea fans that is far more valuable than goals.
Going into battle
If Andy Dunn's claim in The Daily Mirror that Costa boldly stated "I go into battle. You come with me" to John Terry, Branislav Ivanovic and Gary Cahill is accurate, then he has delivered on his promise.
Costa has played much of the season on a dodgy hamstring - sacrificing himself for his team.
The Chelsea fans appreciate players who give their all for the club - which is why they were patient with Torres during his torrid time at the Bridge.
No love lost for Liverpool
Another of Costa's attributes that has endeared him to the Chelsea supporters is the way he has managed to get under Liverpool's skin.
In three appearances for the Blues against the Reds, Costa has scored a winner and clashed with just about every player on the Merseyside club's books.
His alleged stamp on Emre Can looks set to result in a three-match ban; but the Chelsea fans - who absolutely love to hate Liverpool - will probably be quick to forgive him.
After all, they appreciate his confrontational nature - as Liverpool fans loved Luis Suarez for his - and cheer him on during his every "battle".
One man's trash is a Chelsea fan's gold
Nobody can deny that Costa has a discipline problem and he is starting to become a figure of hate amongst fans of Chelsea's rivals.
However, everything that they hate about him, the Blues faithful loves.
It took Didier Drogba - another confrontational Chelsea striker (although he appears to have mellowed with age) - several years to be truly adored by the Stamford Bridge crowd.
Costa has worked his way into their hearts in just half a season - and he shows no signs of slowing down.