Arsenal have struggled at Stamfrod Bridge in recent times, but Arsene Wenger remains confident that his injury-hit side can still cause an upset against the Blues.
A feeling that glory is just round the corner should reside in the guts of every football man. But there comes a point when you have to deliver, otherwise potential becomes failure.
Wengerâ€™s Arsenal have played the most breath-taking football of any English side this past decade but for half that decade theyâ€™ve won nothing.
You have to go back to the 2005 FA Cup Final penalty shoot-out, when Wenger ditched his attacking philosophy and parked the bus at Cardiff to stop Manchester United playing, for his last trophy.
Since that afternoon the much-derided Rafa Benitez has won the Champions League and FA Cup but was forced out of Anfield for being a failure.
There was always going to come a point when Wenger, like his keepers, has to deliver. When heâ€™d go a season too far without a major trophy and his refusal to compete in the transfer market with the biggest clubs in Europe would backfire.
This might be the season and tomorrow at Stamford Bridge might be reckoning day. Win and Arsenal have the platform to mount a genuine title challenge.
Lose and Arsenal go seven points behind Chelsea and can probably forget about the title for another year.
Meaning Wengerâ€™s repeated statements about his team being on the brink of greatness will sound as hollow as the endorsements of his keepers.
And sadly for football, Gooners may start asking if itâ€™s more than the keeper who needs replacing.