Northampton boss Jim Mallinder admits the prospect of a home Heineken Cup quarter-final provides "massive motivation" for Saturday's clash against Castres.
Saints are guaranteed to finish top of Pool One, but victory in France would secure a prized home tie and make Northampton the first English club since Bath nine years ago to win all six group games.
"We know our future is in our own hands and that if we win we will have a home quarter-final, which will be very important as the Heineken Cup continues later in the year," said Mallinder.
"This is a massive motivation. We don't want to be having to rely on other teams in other games, and all of our attention this week has been put towards getting a positive result in Castres.
"Castres are a quality team with a proud record at home, and they have beaten some big teams there this season.
"We know from the home tie against them (Saints won 18-14) that it doesn't matter what team they put out, they will be competitive and very physical."