Champions League humiliation, while coming up agonisingly short in the Premier League has taken its toll on the fans. The once steady support for Arsene Wenger is on shaky grounds as calls for 'Wenger out' grow louder around the Emirates Stadium.

Guardiola, Mourinho, Conte, Klopp -  the Premier League boasts a formidable crop of managers and the budget to go with it, and Arsenal's squad is crying out for a world class striker ahead of what promises to be the tightest title race in years.

The traditional ‘big four’ (Arsenal, Chelsea, Liverpool, Manchester United) is now seven or eight clubs with a genuine chance at a top four finish.

It's not just clubs at the top of the table, the latest $10 billion broadcast deal (which is distributed equally) means every Premier League club from top to bottom has the funds to sign household names.

Albert Einstein defined insanity as "doing the same thing over and over again and expecting different results," and Wenger's efforts to end Arsenal's 12-year league drought have been just that.

The Frenchman has to bite the bullet and buy the finished product, who can slot straight in and hit the ground running next season and with 36 goals in 35 appearances for Napoli last season, who better than Gonzalo Higuain.

Fans were promised that once the $685 million Emirates stadium was paid off, Arsenal would be back challenging the biggest clubs in Europe.

For six years, fans held up their end of the bargain, forking out for the most expensive tickets in the Premier League, while the Gunners failed to win a major trophy in the process.

The stadium was paid off 2014, and it's now the club's turn to hold up their end of the bargain.

Sure, Wenger has made some progress since then, and deserves credit for keeping the club in the top four with side's like this (UEFA Champions League against Olympiakos in 2011).

But to take the Arsenal back to the top of English football, he has to utilise the money available to sign world class players, not 21 year-old Takuma Asano.

Frustrations came to the surface last season, as fed up supporters watched their side squander its best chance at Premier League glory in a decade.

Another underwhelming campaign will be the last straw and will sadly reaffirm the view that Wenger's tenure at Arsenal was a failure. 

Wenger's 20th season in charge will undoubtedly be his biggest test, the 66 year-old has run out of time and excuses - he simply has to deliver.