London Wasps and England star Josh Lewsey says the club face the biggest week in their history, with the Zurich Premiership final coming just six days after 'the biggest game in world club Rugby'.
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Winning the Heineken Cup Final means everything to the London side, filled with World Cup winners and international stars. And Lewsey, a key player in Clive Woodward's world-beating squad, knows exactly how big this match is.
'It's do or die. This is the biggest game in world club rugby,' he said.
'In terms of billing, this game is fantastic. It's the European champions versus the English champions, you couldn't have a better finale to a competition in what has been a superb season.
'With games like this, the important thing is not to play the game too much in your head before kick-off because you can waste too much nervous energy.
'In weather like this against a team like Toulouse, we are going to need all the energy we can get come Sunday afternoon.'
The coaching team at Wasps had been diligently preparing for the Toulouse encounter, Lewsey said.
'We know a lot about Toulouse. We have spent time this week doing video analysis of the way they play, and a few of our side have come up against them at international level.
'I have never played against them myself, but have seen them play on television and am fully aware of the dangers they pose.
'But we have to concentrate on our game and not worry too much about what they are going to do.
'I think we need to concern ourselves on how we will play this weekend. We have put in some fairly impressive performances this season, and if we can raise our game to those levels again then we will have a chance of winning on Sunday.
'I think that the guys take heart in the fact that when we are right mentally we are a good side, but if Toulouse can beat us then they would have deserved it.'