His hat-trick strike against Chelsea at Stamford Bridge and his flick and volley away at Tottenham will live long in the memory of Gunners supporters.
But it was his last-gasp winner away at Tuesday's Champions League opponents Lens that had Arsenal royalty Thierry Henry and Dennis Bergkamp stunned.
It will be the first time in more than 23 years that the north Londoners will have pitted their wits against the French outfit.
And the last time they met, they knocked them out of the UEFA Cup as they booked their place in the final at Lens' expense.
Flash back to the 1999/2000 season, and Arsenal were looking to make their third European final in the last six years.
READ MORE ON ARSENAL
Worry for Arsenal fans as Bukayo Saka limps off against Bournemouth
Saliba admits Arsenal 'could have been champions' if he had stayed fit last season
A gritty 1-0 win at Highbury had Arsene Wenger's side on the cusp of reaching the final thanks to a second minute Bergkamp goal.
But Arsenal didn't have it their own way in the second leg - despite Henry breaking the deadlock just before the break.
Lens then made Arsenal pay for their missed chances to extend their lead as they equalised through ex-Paris Saint-Germain star Pascal Nouma in the 73rd minute to set up a dramatic ending.
Against all odds, a major upset was on the cards as Lens pressed for a late winner to take the tie to extra-time.
Most read in Champions League
Zaha called Man United spell 'hell' - now he can haunt old club in the Champions League
Naples rocked by earthquake hours before Bellingham and Real Madrid take on Napoli
Arteta hoping history doesn't eerily repeat itself as Arsenal eye Champions League revenge
Arteta press conference cancelled as bad weather delays Arsenal's flight to Lens
Centre-forward Bergkamp had been taken off before the game was level, with Wenger then sacrificing his strike partner Henry for versatile defender Gilles Grimandi to see out the match.
So it was all up to Nigerian star Kanu - on a substitute for Bergkamp - to put the game to bed and send Arsenal into their first UEFA Cup final.
And that he did, as the 1996 Olympic gold medallist latched on to a squared ball by Marc Overmars before smashing into the far top left corner in the 87th minute.
It sparked wild scenes inside the Stade Bollaert-Delelis from the travelling Arsenal faithful.
The camera then panned to Henry and Bergkamp on the sidelines, who looked on in awe and relief.
Henry, who was celebrating with his right arm hoisted in the air, then embraced the Non-Flying Dutchman after Kanu yet again did the business.
It was one of 17 goals in all competitions for Kanu in the 1999/2000 season - his best ever return in a single campaign during his 20-year professional career.
Wenger spoke of his relief following the match, with Kanu putting away his only opportunity after his preferred pairing spurned a number of chances.
He said: "It means a lot for me to take Arsenal to a UEFA Cup final, but it was a strange game.
"We could have been two or three up and we should have finished the game off earlier. I never felt under threat too much because I thought we controlled the game.
"I never felt under threat too much because I thought we controlled the game. We created a lot of chances, but like all season, we need too many chances for us to score."
Read More on talkSPORT
Rory McIlroy and Shane Lowry lead 'USA is terrified' chant in wild Ryder Cup celebrations
Neville says Liverpool statement was a 'mistake' and accuses club of being 'aggressive'
Arsenal's failure to convert their chances proved to haunt them in the final against Galatasaray, as they lost against the Turkish giants.
The Gunners, who left Kanu out of the line-up, drew a blank, with the game going to penalties, with Wenger's men losing 4-1 in the shootout.