The former Arsenal, Barcelona and Chelsea midfielder retired at Como in 2023 before joining their coaching staff and becoming manager.
"It was a historic evening for the club and the fans, who will still be talking about it in 10 years’ time," Fabregas told reporters.
"That’s the beauty of football, I hope the fans enjoyed it as much as we did."
Como have seven points from their first three Serie A matches this season and host Parma on Monday.
See all the stats from the match
UEFA Champions League
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