5 reasons why Chelsea are a threat to Manchester City

#3 The promotion of Andreas Christensen to the first team

Stoke City v Chelsea - Premier League

When Gary Cahill and David Luiz were starting regularly at the beginning of the season, Chelsea fans would pray that neither of them make any cardinal mistakes to throw away the match. Time and again, they were proved wrong as both of them made error after error in crucial positions, in even more crucial matches. Then came in this man.

The 3-0 loss away to Roma was the final nail in the coffin, David Luiz, who has since picked up a knee injury, has started just one game against Bournemouth and Andreas Christensen has started the last 5 games in which Chelsea have conceded just two goals ( one to Mohammad Salah, who seems impossible to stop right now).

He has proved himself every time he has started for Chelsea and he has a calm head on young shoulders as he marshals the back line and rarely puts a foot wrong.

Against Newcastle, he made a dashing run from the heart of the Chelsea defence into the opposition half and then threaded a brilliant through ball for Victor Moses. It was reminiscent of John Terry, arguably one of the best centre-backs the world has ever seen, in his prime.

In a team that is infamous for not allowing youngsters to grow, he has laid out a blueprint for future Academy graduates to fight their way into the first team.

With him and the always reliable Cesar Azpilicueta in the heart of the Chelsea defence, they will be a tough nut to crack.