Fabregas had the perfect opportunity to sign off with a goal, but he saw a 30th-minute penalty saved by Forest goalkeeper Luke Steele.
With Chelsea up 2-0 late in the game, Fabregas was given a chance to say farewell to the Blues faithful as he was subbed off by manager Maurizio Sarri.
Fabregas embraced team-mate David Luiz before taking his time exiting the pitch, applauding the Stamford Bridge crowd.
An emotional farewell for Cesc Fabregas 👋😢pic.twitter.com/zR0cRNaywy— Goal (@goal) January 5, 2019
The Spaniard was seen holding back tears as he made his way to the bench for the last five minutes of Chelsea's victory.
The emotion Fabregas displayed seemed to confirm his impending move to Monaco, which Goal reported was nearing on Tuesday.
Fabregas saw his playing time diminish this season, as Sarri prefers to use Jorginho, N'Golo Kante and Mateo Kovacic ahead of the Spaniard in his system.
After moving from Barcelona in 2014, Fabregas has spent four and a half seasons with the Blues, winning two league titles, one FA Cup and one League Cup.