The Blues had the worst record in the Premier League’s top ten with 54 goals against them over the 2019/20 campaign.
It’s something Frank Lampard is keen to put right in the upcoming campaign, and the Blues have added two defenders already.
But where do they rank within the current structure of the first team squad? Football.london takes a look right here.
10. Emerson Palmieri
It hasn’t been a great time for the Italy international at Stamford Bridge and his time with the Blues is set to come to an end.
The left-back is up for sale by the club and will likely head out on either loan or a permanent transfer.
With Chilwell coming in, Emerson is set to be the man who is moved on to make space.
9. Fikayo Tomori
Fikayo Tomori had a decent start with the Blues in his first season as a first team player.
The 22-year-old, however, played just one Premier League game in 2020 and has slipped down the pecking order of centre-backs.
It’s likely, with Silva arriving, that Tomori is the one who will head out on loan, with Everton being interested in taking him.
8. Marcos Alonso
With Chilwell coming in a left-back will have to move on, but it’s not likely to be Alonso who offers something else to the Blues.
The Spaniard may have his faults as a left-back, however he still is a top wing-back and adds an attacking element to the Blues.
However, Chilwell is expected to be the number one left-back and Alonso is in a fight to get a regular spot.
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7. Antonio Rudiger
The centre-back admitted that he didn’t have his best season last year and it could have slipped him down the pecking order.
The Germany international is still an experienced player who, on his day, can be a top defender for the Blues.
However, his individual mistakes over the course of the 2019/20 campaign means that he is in a battle for a place in the side.
6. Andreas Christensen
Andreas Christensen is another centre-back who has had his good moments over the course of the campaign, but also some mistakes.
However, Lampard has faith in the Dane and is willing to give him more time to prove himself.
One of his key strengths is Christensen’s ability to play out from the back, but next season he would have to be more solid.
5. Reece James
The 20-year-old has a bright future ahead of him and is set to be the right-back for many years to come, but he still has a position to fight for.
Right now, Cesar Azpilicueta is still the club captain and that puts him in a stronger position than the youngster.
James could have an exceptional season for the Blues and there is a lot excitement around the player he can become.
4. Kurt Zouma
Towards the end of the season, Zouma was the standout centre-back for the Blues.
That form will likely see him start at the back when the campaign gets under way next week.
With Thiago next to him, Zouma might have a secure partner next to him to help.
3. Cesar Azpilicueta
The club captain had a good end to the season and he still plays a big part in the future of the Blues.
He will be in for a battle, though, with James moving through the first team and pushing hard for a place.
But Azpilicueta is still the club captain and still plays an important part in Lampard’s side.
2. Ben Chilwell
Left-back was a position which Lampard wanted to sort out for much of the campaign, and he managed to get his man.
The 23-year-old is expected to miss the opening few matches of the campaign with his heel injury.
But when he is fully fit, then Chilwell will go straight into the starting XI and be a big part of the side going forward.
1. Thiago Silva
Thiago Silva can be an excellent signing for the Blues with the experience that he will bring to the side over the season.
It’s something that Chelsea desperately missed last season, especially in a centre-back role which struggled to keep things tight.
On a free transfer, Silva can be a key answer to helping Chelsea sort their defensive woes.