Chelsea have not been at their best since their shock Champions League exit at the hands of Paris St Germain last month, and Manchester United are on a run that has seen them record six consecutive Premier League victories.
Mourinho’s men will be looking to this game as an opportunity to prove they are still comfortably the best team in the country, and can all but write their name on the trophy in the process.
The main factor behind their impending success this season has been the summer captures of Diego Costa and Cesc Fabregas, yet it has not always been the Blues producing such smart business in the transfer market.
Here we have identified five of their most pointless signings of all time.
Click on Jose Mourinho to reveal the five most pointless Chelsea signings ever