Ken Pisi admits Leicester have had a psychological edge over Saints, but is adamant his side will end their 10-match winless run against their rivals on Friday night.
The Samoan wing was named man of the match in the 74-13 demolition of Wasps last weekend, grabbing a second-half score that was one of 11 for Saints.
That victory has increased confidence at Franklin’s Gardens, where the latest instalment of the east midlands derby will take place this week.
And Pisi feels Saints have enough to beat Tigers for the first time since September, 2010 and secure a place in the Premiership final at Twickenham on May 31.
“They’ve got that upper hand psychologically, but we’ve been getting closer and closer and I believe that Friday will be our time to get a win,” he said.
“We’ve definitely got the belief. We’re confident, whoever’s playing, and even our bench is strong.
“We’ve got a good vibe all round.”
Saints secured a memorable victory in the Premiership semi-finals last May, slaying Saracens at Allianz Park.
And Pisi says he and his team-mates will draw on that experience as they bid to replicate the achievement this week.
“We do take confidence from what happened at Saracens,” he said. “On our day we’re unstoppable.
“Hopefully we bring that on Friday and the boys will give it their all.”