Fabregas was a member of the Gunners from 2003-2011, until moving to his hometown FC Barcelona, where he played until Mourinho brought him over to Chelsea in 2014.
"My first year here, Arsene [Wenger] had always treated me like a son, but the closest anyone has been to him was Jose".
"The way he treated me, the way he made me feel, how he let me be a leader of the team from day one".
'This was fantastic and in all the four years since I joined Chelsea now they will always stay with me.
Both clubs would love to win the game, as it would be their only chance of major silverware this season.
"The fire - you have it or you don't have it and on Saturday we have to make sure everyone is on top of their game".
Fabregas also opened up on his unfruitful stint at Barcelona, "I was happy at Barcelona but there were players who were there for many years before me". For me, it was different because I went and came back and they paid money for me.
The 31-year-old Spain midfielder won the FA Cup in 2005 with Arsenal, who beat the Blues in last year's final, denying Conte the double in his first season in charge. "That's also because they were such fantastic players, don't get me wrong." .
But the Spain global is hoping to help spoil Mourinho's day on Saturday, when the Blues take on United in the FA Cup final, according to Sky Sports.
The Blues face Manchester United in the Wembley showpiece for the third time, the two teams having previously met in the 2007 and 1994 finals, with one win apiece.
"I promise you, since early in my career I never believed in favourites", he said in an interview with Sky Sports.
He further added, "It's a final, it's a big game and I feel that normally in those games you shouldn't have to motivate players to play football because we do what we love and we always have to do it 120 per cent". So anything can happen.
The Blues were beaten finalists past year, losing 2-1 to Arsenal having fallen behind after just four minutes, and Fabregas says it will be important to start well this time around.
'In the last two years we've been working on the same things with Antonio so we know exactly what we want to do because we repeat it every single day, what he wants from us, so it should always be in our head. I think it is those moments that we sometimes lacked this season. We just need to prepare our game and focus on ourselves.
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