Northampton may have lifted the Amlin Challenge Cup only a week ago but Stephen Myler insists the success of their season will be decided by Saturday alone.
Saints are hoping to secure their first Aviva Premiership title when they face strong favourites Saracens in front of a sell-out crowd at Twickenham.
Last year was their only previous appearance in the final, losing heavily to Leicester, and Myler admits it is time for Northampton to be crowned English champions.
"The league season is our acid test as a club and squad. We've progressed a lot this year, but it comes down to one day determining whether we've been successful or not," he said.
"That's bit of a funny scenario to be in, but it's what we must work hard for and hopefully we can do it. I believe it will come down to who plays best on the day.
"It's one each between us and Saracens in the league and we're expecting a tough battle, Saracens at their best.
"They have quality players, so I'm sure they're professional enough to overcome losing in the Heineken Cup final last weekend and get back on page for this game."
Myler was named man of the match against Bath in last Friday's European final, continuing a terrific season that could have seen him win his second cap in England's first Test against New Zealand on June 7 had be not been action against Saracens.
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The coach of Northampton Saints Jim Mallinder has described last night's victory in the Aviva Premiership Semi-Final as 'absolutely tremendous', especially as his side lost to Tigers in last year's final.
"We've played Leicester numerous times since I've been here, we've won a couple but not recently and I think to win such a big game like that the semi final of the Aviva Premiership in front of our home fans was absolutely tremendous."
Speaking after defeat in the Aviva Premiership Semi-Final to Northampton Saints, Director of Rugby Richard Cockerill said:
"We gave everything, it's been tough year, we were close to winning we could've won it if we'd managed the game a bit better at times and our discipline had been a bit sharper but Saints are a good side, they played well, they took their opportunities and that's life"
Northampton Saints have beaten the Leicester Tigers 21-20 in the Rugby Union Premiership semi-final. It means the Saints will now play at Twickenham.
It is not just local pride and the bragging rights that are at stake tonight, but also a place in the Premiership Final, as rivals Leicester Tigers and Northampton Saints square-up.
The Tigers welcome back six internationals for their trip to Franklin's Garden, including Niki Goneva.
Meanwhile, George Pisi and Samu Manoa will be among those re-joining the starting 15 for Saints.
Northampton will be hoping for revenge after Leicester beat them in the final last year, so tonight's match has all the ingredients for a cracker.
Richard Cockerill, Director of Rugby at Leicester Tigers, and player, Tom Croft, have been looking ahead to the encounter.
Northampton Saints beat Saracens 20-16 at Franklin's Gardens in the LV= Cup.
The Heineken Cup 2013-2014 fixtures have been released, with current Aviva Premiership champions Leicester Tigers playing Ulster Rugby on October 11.
The Northampton Saints will play Castres Olympique the day after.
England Head Coach Stuart Lancaster has named five Northampton Saints players in his side to face Argentina on Saturday.
Flanker Tom Wood will captain the side, and scrum-half Lee Dickson will also start, in the first of the two tests.
The substitutes include prop Paul Doran-Jones, lock Courtney Lawes and full-back Ben Foden from the Saints. And they will be joined by Worcester Warriors flanker Matt Kvesic, who will make his debut for England should he come off the bench.
Leicester Tigers manager spoke to ITV News Central after the game yesterday against Northampton Saints.
Leicester Tigers came away with the Aviva Premiership trophy after a thrilling 37 - 17 game at Twickenham.