The 67-year-old Frenchman's brow has been constantly furrowed this season with intense speculation about his future overshadowing a campaign that saw the Gunners fail to finish in the top four for the first time since he took charge in 1996. "I'm happy for the manager, to get another FA Cup, I'm delighted", Aaron Ramsey told BBC Sport after his late victor.
"My agent speaking after..." However, immediately prior to the goal, it did appear Sanchez's arm connected with the ball as Chelsea attempted to clear their lines, resulting in him collecting possession and scoring.
Arsenal even had the luxury of a man advantage from the 68th when Victor Moses received a second yellow card for diving.
The victory marked an incredible turnaround in fortunes for Arsenal, who finished fifth in the English Premier League - which ruled them out of next season's Champions League. I'm sure he wants the best for the team and if he thinks that is the way to go, you have to go with it, we are a team.
Arsneal rode out the final attacks to claim a much-deserved victory and Arsene Wenger's seventh FA Cup win.
The most damning tweets came soon after, with Chelsea arguing Ramsey was "clearly offside", describing the decision as a "harsh one".
Vettel victory not orchestrated by Ferrari - Wolff
Hamilton pitted and jumped both Daniil Kvyat and Romain Grosjean to emerge in seventh spot, to bag six points from the weekend. But Ferrari's resurgence this season, and Hamilton's vehicle troubles, makes a sixth victory far from a foregone conclusion.
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Arsenal produced their best performance for years and Mertesacker said that the high level the team reached was testament to Wenger's continued management of the club. The Welshman had also scored the winning goal in the 2014 cup final against Hull. I know my mind.
Diego Costa revived Chelsea in the 76th minute when Arsenal goalkeeper David Ospina failed to keep out his deflected shot.
But if a compromise can be reached that Wenger accepts, he is set to be handed a sizeable transfer kitty to turn Arsenal back into contenders. We needed to hold on but we were maybe not paying attention.
A mesmerising Arsenal side outplayed the Premier League champions; they should have won be a far greater margin, hitting the woodwork three times; they played like a Wenger side, but one from twelve years ago.