Chelsea may only be fourth in the Premier League table, but they are far away from the peak of their powers right now.
Losses to Burnley and Crystal Palace have shown how vulnerable the Blues are this season. However, their 3-0 loss to Roma last time out has worried boss Antonio Conte the most.
The Blues are now a point behind the Italian giants in Group C of the Champions League, but Atletico Madrid are just four points behind them in third and have a game to play against Chelsea, too.
This Sunday, Chelsea are set to host Man United in a fixture that will bring former boss Jose Mourinho back to Stamford Bridge.
Given Chelsea's recent form and the way that Manchester City are running away with the Premier League title, it has become a must-win encounter for Conte's men.
And it appears the Italian is prepared to make some radical changes to ensure that happens.
According to The Sun, David Luiz is set to be axed from the squad altogether and Gary Cahill isn't far behind.
Conte blames the pair for the shambolic defending against Roma and ahead of the Man United fixture, the Blues trained with Andreas Christiansen as part of the back three in place of Luiz.
The eccentric Brazilian returned to Chelsea last season in a £34 million deal after two seasons with Paris Saint-Germain and he played a vital role in the Blues securing the Premier League title.
His stock has fallen considerably this term, though, and Conte is said to have become frustrated with his performances.
While there have been no public bust-ups between Conte and Luiz, the report suggests tensions have been high between the pair ever since the Roma game.
Conte is not a manager a player wants to fall out of favour with and Diego Costa found that out the hard way over the summer before his move back to Atletico Madrid.
While plenty of Chelsea supporters have complained about Cahill for a while now, Luiz has remained a fan favourite at the Bridge and if Chelsea loses to United without him, fingers will point squarely in Conte's direction.