#3 Manchester City
Pep Guardiola is one of the best tactical minds in the game and it is clearly seen in the Premier League. The Spanish manager has already won the league three times and his team has done well so far this season.
Manchester City have been a dominant force in the league for the past few years and some of the credit goes to their defense for it. Guardiola has assembled a group of smart and impactful defenders who are not only effective defensively but also productive in the attack.
Young Ruben Dias has become a leader at the back and can do well when paired with John Stones or Aymeric Laporte. Kyle Walker and Joao Cancelo have been immense on the flanks and it is surely not easy to score against this Manchester City side. The Citizens have conceded just six goals so far, boasting the second-best defense in the Premier League.
#2 Chelsea
Thomas Tuchel has drastically changed Chelsea from how they performed under Frank Lampard. The Blues look a compact and glued unit under the German manager.
After their UEFA Champions League triumph last season, Chelsea have carried on with their good form this season. The London club have been almost impenetrable and the perfect example for that would be their Premier League match against Liverpool. Even after going a man down, the Blues stayed resolute and secured a draw at Anfield.
So far, Chelsea have conceded just four goals this season, having the best defensive record in the league. They have conceded joint-least goals in Europe's top five leagues but end up second on this list behind Napoli, who are unbeaten in Serie A at the time of writing.
#1 Napoli
The Serie A table looks very surprising right now with Juventus ranked seventh, Napoli at the top and Milan after many years strongly challenging for the title. With such intense competition going on, Napoli have managed to do a great job.
Luciano Spalletti's side are yet to lose a game, one of the few sides left to do so in Europe's top five leagues. With experienced defenders like Kalidou Koulibaly, Mario Rui, Kostas Manolas, Juan Jesus and others, Napoli will be the team to beat in Serie A this season.
Having conceded only four goals this season, Napoli have the best defensive record in Europe's top five leagues so far. With their goals conceded per 90 minutes ratio being 0.33, their defense have to be applauded for the amazing work they have done.