Arsenal have only once failed to reach Europe's elite competition and that came in Wenger's first season in 1996-97.
But the influx of new club owners and millions of pounds spent on transfer fees, the Arsenal manager insists there is no longer a 'top four'.
Wenger said: "I think there is a top eight or nine who can fight for that [the Champions League places].
"It is very open and I think it will be more and more open because there are so many investors who have come in.
"So it's a top eight, nine. It will be harder than ever to finish in the top four."