First-half goals from Alexandre Lacazette and Laurent Koscielny were enough for the Gunners to dispatch Maurizio Sarri's men and get their top four ambitions back on track.
The win also comes as a relief for the Gunners after their disappointing loss to West Ham United at the London Stadium last Saturday.
And the 42-year-old who won two Premier League titles and two FA Cups with the north London club took to social media to celebrate the victory.
"Congratulations Arsenal," Kanu tweeted.
Arsenal, levelled on points with Manchester United, are now three points behind fourth-placed Chelsea.