The Gunners have slipped 12-points behind leaders Chelsea after back-to-back defeats to the Blues and Watford.
But the Frenchman insists there's a long way to go yet.
Manchester United aim to keep pressure on the top four when they weclome Watford to Old Trafford.
United are on a 15-game unbeaten run – their longest since Alex Ferguson retired in 2013.
Middlesbrough will be hoping to end a seven-game winless streak when they host Everton, Mamadou Sakho could make his Crystal Palace debut in their game at Stoke.
Sunderland boss David Moyes is hopeful of having Ireland defender John O'Shea available for their match against Southampton at the Stadium of Light.
And West Ham host West Brom.
Liverpool play Tottenham Hotspur in the evening game at Anfield, which kicks-off at 5.30pm.
