The 29-year-old made over 300 appearances for the Gunners, who travel to Stamford Bridge on Saturday seeking to end Chelsea's 10-match winning run at home.
Fabregas was made captain of Arsenal aged 21 and spent eight years under Wenger at Highbury and the Emirates Stadium.
He rejoined Barcelona in 2011 before returning to England in 2014, signing for Chelsea when Wenger declined to take up an option on his former skipper.
The Spain playmaker insisted there were only fond memories, not bad blood, despite some Arsenal supporters turning on him for his move to Chelsea.
Fabregas told Natacha Tannous, a journalist and partner of former Chelsea midfielder Michael Ballack in an interview on YouTube: "Yes, forever
There's something that will never change.
"There's many things said about me, about Arsenal.
"I don't really care what people think about me any more
It's just about what I feel towards them.
"Arsenal will always be the team that believed in me the most
I was a young kid, 16 years old, playing for Barcelona.
"Arsene Wenger, especially, and Arsenal Football Club, gave me everything.
"Without them I would not be a World Cup winner, a European Championship winner
And I would not have experienced all of this that I'm doing in my life.
"I will always forever be grateful."
Chelsea won 13 successive Premier League games between losses at Arsenal in September and Tottenham last month.
And Fabregas and Eden Hazard will be looking to consolidate Chelsea's place at the top of the table against Arsenal this weekend.
Chelsea lead second-placed Tottenham by nine points, with Arsenal behind Spurs on goal difference.
Hazard told former Arsenal striker Thierry Henry in a Sky Sports interview that the Gunners and Manchester United are Chelsea's biggest title rivals.
And Henry then asked Hazard to appraise the differences between Chelsea head coach Antonio Conte and Jose Mourinho, the former Chelsea boss now in charge of United.
"Tactical training," Hazard told Sky Sports.
"We do more with Conte
We know exactly what to do on the pitch, where I have to go, the defenders (know) where they have to go
We know exactly what to do.
"With Mourinho it was just he put the system (in place), but we didn't work a lot (on it)."
Mourinho might point to the fact that Chelsea's fixture schedule allows for more tactical work, due to the absence of European football.
However, Mourinho is culpable for that after a miserable title defence last season which resulted in his sacking for a second time.
Hazard, who has nine goals this season, seems to be enjoying playing without any defensive duties.
He added: "I just need to be ready for if we get the ball
Source : PA