Wasps director of rugby Dai Young is confident his side will book their place in next season's European Rugby Champions Cup following their narrow 30-29 first-leg win over Stade Francais at Adams Park.
Waisea Vuidravuwalu's 74th-minute try had put Stade on the verge of victory but a late Andy Goode penalty gave Wasps a narrow one-point lead to take to the second leg of the play-off in Paris on Saturday.
"I always felt we'd have to win both games to go through. I never felt we'd have a huge lead leaving Adams Park to go there and sit back on," Young said.
"It would be very dangerous to sit back against a team of their quality and hope they don't score too many points, because they will.
"We showed we can cause them problems in this leg so we'll go to them full of confidence and belief.
"We respect how good they are and how big a challenge it is, but this doesn't change anything because we always felt we'd have to go there and win.
"Beating them makes a difference to the psyche - we're 1-0 up.
"The players came into the dressing room with their heads down and I told them there's nothing to have your heads down about.
"They should be proud of that performance because we caused Stade lots of problems.
"We should have been going there with a 10-point lead, but that doesn't change the fact we can go there and win."