After starting out with Arsenal as a roaming attacking midfielder with a clinical eye for goal and a deft pass, Fabregas moved into a deeper-lying position over the years where his vision of the game and outstanding passing range helped him to remain influential in games with Chelsea.
"We are very pleased to welcome Cesc Fabregas to AS Monaco, a world-class player and a great professional, whose arrival demonstrates the ambition of the club", said club vice-president Vadim Vasilyev.
After winning two Premier League titles with the Blues, he has fallen out of favour at Stamford Bridge this season under new coach Maurizio Sarri.
Mourinho free to return to Real
He reigned at Old Trafford for just two and a half years and won an Europa League and EFL Cup titles for the club. Sacked Manchester United boss Jose Mourinho has opened the door to a return to Inter Milan and Real Madrid .
What his departure does do is free up a large chunk of Chelsea's wage bill, with Fabregas the third-highest paid player at the club behind N'Golo Kante and Eden Hazard despite only having six months left on his contract.
Fabregas arrived at Stamford Bridge as a 2012 European Championship and 2010 World Cup victor with Spain.
The former Marseille and Roma player was expected to put pen to paper on a move from Turkish club Antalyaspor, but Monaco announced earlier on Friday that he had failed a medical due to a calf problem.
"The Avengers" Cast Reportedly Preparing To Host The Oscars
It's been nearly 30 years since that Oscars ceremony, and it's still considered the biggest disaster in the award show's history. Sources told Variety that producers will select A-listers to introduce segments like the opening monologue and performances.
2019 iPhones’ big feature will be an extra camera lens
That led Apple to aggressively market the iPhone XR on its website for $449, about $300 less than its official sticker price. If Apple does go down this route, it wouldn't be the first smartphone manufacturer to do so.
Alien signals? Experts get radio waves from space
Therefore, the signals have remained a mystery, with little evidence at all of where they might be coming from. Chime astrophysicist Dr Ingrid Stairs , from the University of British Columbia , explained its significance.
Led coalition: American withdrawal from Syria has begun
Turkey considers America's Kurdish allies of the YPG militia - who were vital in the ground war against ISIS - a terrorist group. Mr Trump initially signalled a rapid withdrawal from Syria and USA officials said they expected troops to be out with 30 days.
Dollar falls for a third day on rate pause bets
The Bloomberg Dollar Spot Index dipped 0.2 percent.The euro bought $1.1415, up 0.2 percent.The pound rose 0.2 percent to $1.2749. The crude benchmark rose 54 cents on Monday to $57.61 a barrel, while US crude futures gained 53 cents to $48.49.