Claudio Ranieri’s Leicester City continue to defy expectations this campaign and currently sit joint top of the Premier League with more than half a season complete.
Prior to their clash with Tottenham on January 13, many believed that the Foxes were beginning to run out of steam having failed to score in three consecutive league matches, yet win they did with a memorable 1-0 victory at White Hart Lane.
Their performance against Mauricio Pochettino's side was yet another indication they're capable of a top four spot this season.
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The question remains, though, of just how they've transformed from a relegation-threatened side to one capable of challenging for a European spot? Well, the answer to that is Ranieri and his tactical know-how.
The Foxes have deployed a traditional 4-4-2 formation in almost every game this season - one rarely seen in the Premier League, with the exception of Watford.
Each player has a well-defined role and position in the side, which they diligently stick to in order to function well as a team.
The 4-4-2 formation was once the most common of tactics used in football amidst a time of European clubs preferring to play two strikers. However, since the introduction of Barcelona's tika-taka football, emphasis has shifted to a lone striker and more bodies in the middle of the pitch.
Defending became an equally important facet of the game, with defensive midfielders emerging amongst the three fielded through the centre of the park.
Football has become far more intricate and complex over the past ten years, and it's largely thanks to the brand that Pep Guardiola introduced at the Camp Nou.
Ranieri, meanwhile, has resurrected the 4-4-2 system during a time where teams are learning and adapting to deal with formations involving a lone striker. Under the Italian, Leicester are playing a simple yet effective style of football that their opponents have found difficult to cope with.
And with the Foxes profiting so immensely from restoring an old tactic, who knows - perhaps 4-4-2 will become football's next tika-taka.
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