It's a clash of the titans at the Aviva on Sunday as Leinster host Toulouse in the semi-finals of the Heineken Champions Cup.

The teams have lifted the European Cup a joint-record four times each, though the French side's last title came in 2010 - Leinster have won three since, including last year.

It is commonly believed that French sides prize their domestic competition ahead of European success, an approach that contrasts with that of the Irish provinces.

Given Toulouse haven't won the Top14 since 2012 and are sitting astride the table with four rounds left to play, might they then be inclined to view the Champions Cup as a secondary objective?

Not a chance, says Scottish lock Richie Gray, who will play his first semi-final in the competition, if selected.

"This is still a huge club with huge ambition and we want to do well in both competitions," he told RTÉ Sport. "There is no priority given to any competition.

"I can’t speak on behalf of other clubs. I know that Toulouse want to do as well in Europe as they want to do domestically."

Johnny Sexton celebrates with Stuart Lancaster (L) and Sean O'Brien after last year's Champions Cup victory

Johnny Sexton has revealed that Leinster used the challenge of drawing level with Toulouse as a motivational tool last season and, contrary to another team in blue based in Dublin, are quite open that it's all about the 'drive for five' this year.

Gray, though, insists Toulouse are not looking quite so far ahead.

"I’ve not heard the conversation happen," he said. "We’re just looking to win a game of rugby, try and go as far in the competition as we can.

"It’s not about trying to stay ahead on European titles

"We've been playing some good stuff. We'll certainly take confidence from our season so far."

The sides are more than familiar with each other after meeting twice in the pool stages.

Toulouse upset the champions 28-27 at the Stade Ernest-Wallon in October, which Gray admits boosts confidence ahead of this weekend's clash.

"We take a huge amount from it. We take belief from it, we look at the things that went well and we work on that.

"But we know that Leinster at the Aviva is a whole different story. We are aware that we'll need to up our level if we're going to beat them on Sunday.

"Obviously, it's a huge challenge, going to the Aviva Stadium and playing arguably the best team in Europe at this moment in time, and over the past few seasons.

"But it's one we are really looking forward to."

Things didn't go quite as well in the return fixture however, Leinster outscoring Toulouse four tries to one at the RDS in January.

"We weren’t as clinical as we could be," reflects Gray, who made his comeback from a long injury lay-off a fortnight later.

"There were dropped balls in key areas - if we had held onto, who knows – which let Leinster off the hook.

"Leinster did what they do well, put pressure on, put us back in the corners and kept the ball. We know that we just have to be more clinical this weekend.

"We'll work during the week and look at some things where we feel we can do better. I think, if we can fix those things, it will be a good game.

"They're a very good defensive side and they hold the ball incredibly well so it's going to be a huge challenge. We'll have to be at the very best of our game."

(Toulouse will wear special jerseys with an image of Notre Dame, which will be auctioned to help raise funds for the fire-damaged cathedral in Paris)

Gray was on the scoresheet as Toulouse warmed up for Leinster by coming from 44-33 down to beat second-placed Clermont in a thriller last weekend.

"I think in the dressing-room there was a huge amount of relief. In all honestly, we got out of jail I think," he admits.

"Delighted to beat a team like Clermont and stay top of the league but we know we need to sharpen up against Leinster. If we give Leinster 44 points, it could be a very difficult day at the office."

Also among the try-scorers was fleet-footed South African full-back Cheslin Kolbe, who Leinster will need to keep a close eye on on this weekend.

"He's unbelievable isn't he?" enthuses Gray. "He can really make something out of nothing. I think last weekend, he slipped, fell over and then he managed to score a 40-metre try. It's just silly stuff – you can't believe it is possible.

"You can't touch him (in training). You try and tackle his shadow. That's the best you can do. He really is pretty impressive."

Follow Munster v Saracens (3pm, Saturday) & Leinster v Toulouse (3.15pm, Sunday) via our live blog on RTÉ.ie/sport and the News Now app.

Listen to live national radio commentary of Leinster v Toulouse on RTÉ Radio 1's Sunday Sport.