Chelsea turned on the style to thrash Arsenal 4-1 in Baku, as an impressive second-half display swept aside their London rivals thanks to goals from Olivier Giroud, Pedro and a brace from the departing Eden Hazard.
Cahill, 33, remained on the bench throughout, with Sarri opting to bring on Davide Zappacosta, as his final substitute, for Hazard in the 89th minute.
The defender will leave the club after they opted not to renew his contract and former midfielder Fabregas feels he should have been afforded the chance to bow out one last time.
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Instead it was left to captain Cesar Azpilicueta to show his class, as he invited Cahill up on to the podium to lift the trophy.