The Spanish midfielder went into the 2017 showpiece game at Wembley hoping to complete a league and cup double, only for his old club to emerge victorious as they ran out 2-1 winners.
The ex-Arsenal man says he has plenty of regrets from that particular day but is confident they can avenge that loss as the Blues put the finishing touches to their preparations for the clash with Manchester United.
"You don't want to be on the back of losing two FA Cup finals in a row," Fabregas said. "Last year we didn't play well. Arsenal were on top of us and I think they deserved to win.
"It would've been a fantastic season winning the double. We have this regret in our head and we want to make it right this time for sure."
The 31-year-old has picked out Eden Hazard as being key to Chelsea's chances of success at Wembley, believing he has the talent to unlock United's backline.
Hazard has been heavily marked by the Red Devils since Jose Mourinho's move to Old Trafford, with the former Blues boss clearly determined to nullify the threat of the Belgium playmaker as a priority.
"He's a fantastic player. When he's on his day he can be unstoppable," said Fabregas of Hazard. "We have to make sure we give him the right service so he can work his magic and give us a good performance, because we will need that."