Leinster currently top Heineken Cup Pool 2 and despite losing away to Castres Olympique last time out in Europe, they have bounced back to win their last four Magners League matches.
Wasps are also in good form, having won seven of their last 10 games in all competitions and Reddan agrees that Ian McGeechan's side have turned a corner since their RDS humbling.
"We're a tighter unit now, but it's much easier to improve when you're in a tight spot," said the Limerick man.
"Back then, we weren't playing well and in terms of results and performances, we could only move forward.
"Our confidence, self esteem and what we were trying to achieve was only going to get better because we were at such a low point. Both sides have good form, so it will be a huge clash.
"Whoever wins will be in pole position to qualify. We've got a tough final match in Castres, so we can only think about Leinster. We need a good result, definitely."
Of his prospects of featuring for Ireland in the upcoming Six Nations championship, Reddan was keeping quiet and will hope to let his rugby do the talking.
"I've got no thoughts on Ireland and the Six Nations just yet. This is a club occasion this weekend and I want to just worry about passing, running, kicking and tackling.
"It's great playing in big games because all you need to do is calm down. We'll make sure we're ready but not over eager, you know.
"Leinster travel well, especially on the big occasion, and I can remember when they turned over Toulouse away three years ago. We are expecting a tough and high intensity match."
