
“Offence wins you games and defence wins you titles”. it is a common saying in football and it is very much true. A solid defence is a trademark for any club which has won trophies, even if the club plays attacking football.
In their title-winning campaign in 2014 they had the best league defence conceding only 32 goals. While in their 2017 title-winning campaign they just conceded 33 goals. But this season their defence was not even half good as it was last season. And this is the situation after they have been given protection by the ever-present Ngolo Kante.
Gary Cahill often cracked under pressure and was inconsistent, while Christensen showed promise but he was burned out by fatigue. David Luiz remained sidelined for the majority of the campaign. Rudiger was poor at the start of the season and it took him some time to settle at Stamford Bridge. The only bright star of Chelsea’s defence was Azpilicuetta.
It is very much clear that Chelsea need new defensive reinforcements and these players could just be perfect for them:
#4 Jamaal Lascelles (Newcastle)

Many have compared him with Chelsea’s legend John Terry due to inspirational leadership skills and manager Rafa Benitez heavily relied on his captain to help them survive in the Premier League.
According to reports, he is a huge target for the Blues as they look to rejuvenate their backline this season. Chelsea have been keeping tabs on him since 2016 and it seems they are ready to make a move for him. Also, since the departure of John Terry Chelsea have lacked a leader in their team and he could just be the answer to that.
The Blues are likely to face competition from local London rivals Spurs for the Newcastle star. The Magpies are said to be demanding somewhere around £45 million for their captain.
#3 Kalidou Koulibaly

The Senegalese international has made quite a name for himself due to his impressive performances for Napoli. Thus it is no wonder that he has been linked with many top teams across Europe.
He is 6’5 inches and possesses impressive physicality, which should help him adjust to the physical style of the Premier League. He is good with his feet and is an ariel threat as well inside the box.
Napoli have reportedly named their price for their star man and are prepared to sell him. Also, he is just 26 and should a good long-term option for Chelsea.
#2 Jerome Boateng (Bayern Munich)

The former Manchester City defender is capable of playing as a centre back and a right back as well and this season he made just 19 Bundesliga appearances for the Bavarian giants.
He would definitely be an upgrade for Gary Cahill who has been inconsistent and error-prone as well. Boateng has already publicly stated that he seeks a new challenge and believes at his age a move away from the Bundesliga can be considered.
Chelsea are likely to face competition from the likes of Liverpool, Manchester United Juventus and Napoli, who are keen on signing him.
#1 Stefan Savić (Atletico Madrid)

Though there was a time when he used to play in the Premier Leauge with Manchester City. During his time at Manchester City, he did show signs of his potential but he only lasted one season with the Citizens.
Chelsea are said to be interested in the defender and they are in talks with Atletico Madrid for him. But they will face competition from Juventus for the centre back.
Though Savic might not be the leader type of player, he is certainly very good performer and would be a great addition to the Chelsea squad.At the age of 26, he is about to reach his peak and he would be a good replacement for Gary Cahill or David Luiz in Chelsea’s line up.