Thomas Vermaelen's warning to his Arsenal teammates that Celtic will be no pushover in Tuesday night's Champions League qualifying round clash, should be food for thought for the Gunners.

Arsenal can take many positives from their opening Premier League fixture against Everton, thumping the Toffee's 6-1. However, Tuesday night's game, arguably represents Arsenal's most important game of the season, the entire season.

Not only does Champions League qualification provide vital revenue needed to sustain transfer activity, but it also eases financial pressure on debt repayments for the Emirates and Highbury developments.

Arsenal's seemingly timid transfer activity so far can be explained in terms of Tuesday night's game against Celtic.

Reported transfer targets such as Rafael Van der Vaart and Brede Hangeland, will be looking to Tuesday's clash to make sure any proposed move to Arsenal will include Champions League football. This is a necessity for any top-drawer international player in a World Cup year.

Tuesday really is all or nothing and Arsenal must know that fortune will only favour the brave.