"You don't want to be on the back of losing two FA Cup finals in a row", Fabregas added.
Some of the latest transfer speculation involving Chelsea...
But former United striker Andy Cole has backed the big Belgian to win his fitness battle, telling the club's website: "It may be hard for him but, hopefully, he'll be passed fit and do the best he can".
He was rewarded for his efforts by landing both the Premier League and League Managers Association Manager of the Year awards at the LMA awards dinner on Tuesday evening.
"Good coaches there are many, but I like to make my assistants". They went out to Spanish side Sevilla in the Champions League Quarter-finals in an unexpected yet fully deserved defeat at Old Trafford. On the day, they can cause problems for anyone. Midfielder Marouane Fellaini is available for selection.
The preparation techniques used by Chelsea could be mistaken as fun exercises but most of the pieces of equipment used by the Chelsea players were used to condition and improve strength.
Chelsea will be without David Luiz and Ethan Ampadu for the final.
The FA Cup finals have been as eagerly awaited with both managers desperate to avoid the ignominy of ending the campaign without any silverware.
This season Conte said Mourinho was suffering from senile dementia, and the Manchester United boss responding by pointing to Conte's match-fixing suspension at his former club Siena, which he was later acquitted of.
José Mourinho insists the past is irrelevant as he prepares to face his former club Chelsea for the chance to lift the FA Cup, and promises an "entertaining" final, albeit on his own terms.
"Our history of what happened between us: I played for Arsenal and him (managing) Chelsea, (playing for) Barcelona and him (managing) with Real Madrid, we were confronting each other, but then we humbled ourselves and started a good relationship", the 31-year-old continued. "So I hope it will be a good match and, at the end of it, I hope the trophy will be waiting for Chelsea". Hopefully, we can get one this year.
When things are going well, all these things feed into a team's morale and right now, Chelsea are a pale shadow of the united group which won the Premier League under Conte previous year.
"I will focus on the desire of my players to become a better team and every day that's what I will try to do - to improve on the pitch and improve our players". United could do with a repeat of that on Saturday.
The FA Cup is a competition Sanchez knows well.