Chelsea's manager has explained that he plans to use Fabregas as a number eight and a number ten in the upcoming season.
Fabregas joined Chelsea from Barcelona this summer and it seems that his manager is a fan of his versatility as much as his ability.
Mourinho explained that he could use Fabregas’s ability to dictate play from deep in a ‘number eight’ role for his side in some matches, while utilising his skills going forward in others – where he will play in an advanced midfield role.
"He is not on the foreign list, as he counts as a homegrown player, which was important and he is not on the foreign list for the Champions League either. They were important factors.
"I see him everywhere because he can play everywhere.
"His best quality is the speed where he analyses the game and executes. He is difficult to shake off the ball or make the wrong decision. He can accelerate the intensity of the game or he can reduce it. He's very intelligent. And he has goals.
"He is the missing piece."
Fabregas is one of three high-profile summer additions for the Blues so far during this transfer window.
Mourinho has been active, bringing in the likes of Filipe Luis and Diego Costa alongside Fabregas to strengthen his side’s chances of winning the Premier League campaign.
They have already been installed as the bookies’ favourites ahead of the season and it is easy to see why given the amount of quality that they have.
Fabregas’s main competition in the number 10 role will come from Oscar, although Marco Van Ginkel will also be hoping to get some appearances this season after injury stifled his progress last campaign.
In the deep-lying role, the Spanish international will also have to displace the likes of Ramires and John Obi Mikel for a spot in Chelsea’s line-up, with Nemanja Matic almost certain for selection as the team’s enforcer.
The hope is that Fabregas will be able to show the ability that made him a star at Arsenal when previously in the Premier League, although it interesting that Mourinho has not outlined a defined role for his new recruit.
In bringing the 27-year-old in Mourinho is widely thought to have brought in one of the best quality players in the Premier League. Fabregas cost Chelsea around £30million and, for a player of his class in this market, that seems a price which is very reasonable.
If he is to be Chelsea’s ‘missing piece’, as Mourinho claims, he may just turn out to be one of the bargains of the summer.