Aurelien Rougerie believes defence will win the day when his table topping Top 14 ASM Clermont Auvergne team go into their must-win clash with the Ospreys at Stade Marcel Michelin on Saturday.
With the Ospreys unbeaten and four points clear at the top of Pool 3, French star wing Rougerie accepts a third defeat would be a major setback - although they go into the contest boosted by a 16-15 victory at Toulouse at the weekend that earned them the leadership of the Top 14 table.
"We know we are in for a big clash and that the game is vital if we want to qualify for the quarter-finals," he said. "If we lose at home against the Ospreys that will be it, we will be out. There is no room for error, we can't afford to lose.
"I think defence will be a key point for both sides and in Round 2 we had a taste of just what tough and fierce opponents the Ospreys are. They are a complete side with powerful and mobile players up front and a fast backline who enjoy playing out wide - they are good at piercing defences and scoring tries.
"The game in October finished with a really tight score to them of 25-24. We were too slow starting and they put a lot of pressure on us, they smothered us and we couldn't impose our game in the first half.
"We managed to get back but it was a really tough match. They have so many quality players and also plenty of international experience.
"As for their backs and looking at how they play, Barry Davies, Nikki Walker and Tommy Bowe must spend a lot of time training on support, especially Davies as he is a bit more powerful than when he was with Brive.
"They also have very good handling skills and are really keen to get their hands on the ball. All this talent and the hard work they put in is proof the team is serious about the job.
"We have a lot of talented players and we also like to run the ball. In the games against Leicester, it was a real treat because we got to express ourselves on the field. It did us a lot of good and allowed us to play this Heineken Cup
campaign on a better note.
"It will only be when each player takes more individual responsibility that we will progress as a group and be able to go further in this tournament.
"I was rested for last weekend's Top 14 16-15 win at Toulouse due to long-lasting minor glitches and to avoid any potential complications. The staff wanted to have a turnover in the squad anyway so it was ideal for me to have a break.
"We are already suffering from the absences of Jason White and Julien Bardy who sustained tibia and fibula fractures respectively so we did not really start the new year on the right foot and let us hope the number of long-term injured players will not increase otherwise we will struggle to finish the second part of the season."
Clermont have not qualified for the Heineken Cup knock-out stages since the 2001/02 season but they are double European champions after winning the Amlin Challenge Cup tournaments in 1999 and 2007.
"So far my best memory in Europe remains our victory in the 2007 Challenge Cup final against Bath," said Rougerie.
"That was a great moment because although we generally do well each season in our domestic championship, we had been struggling for a number of years to win any silverware and that trophy was most welcome. We have been surfing on that good vibe ever since and we always try to find our inspiration from that experience to keep a positive spirit."
Whenever Bedlinog tackle Penallta a massive fixure is guaranteed but this Sunday there will be even more emphasis placed on the two rivals when they contest the SSE Swalec Plate final at Principality Stadium.
Ahead of their SSE SWALEC Bowl Final clash with Taffs Well at Principality Stadium on Sunday, Burry Port share their #FABXV nomination with WRUTV in the search for Welsh rugby's greatest volunteers. Everyone can get involved by sending nominations via twitter to @WRU_Community using the hashtag #FABXV
Cardiff Blues prop Gethin Jenkins and Ospreys centre Ben John look ahead to the first game at Principality Stadium in Saturday's double header which is promising to be a special occasion for all Welsh fans.
Carmarthen Quins Director of Rugby Ian Jones and committee member Jeff Thomas along with Llandovery chairman Handel Davies look ahead to Sunday's SSE SWALEC Cup showdown where both teams are out to prove 'West is best'
SWALEC ambassador Shane WIlliams is looking forward to Sunday's Finals Day where the Cup, Bowl and Plate offers a great opportunity for players and teams to experience the magic of playing at Principality Stadium
Carmarthen Quins coach Richard Kelly believes it is an exciting time to be part of the Scarlets region as his side take on local rivals Llandovery in the SSE Swalec Cup final on Sunday, as WRU TV's Graeme Gillespie discovers
Scarlets long serving prop Phil John talks to WRU TV's Graeme Gillespie about Judgement Day IV and SSE Swalec Cup finals day. The last time Llandovery were in the cup final in 2007, the Drovers claimed the spoils with Phil playing a major role in the engine room.
Meet Aberdare coach Luke Thomas whose #FABXV nomination goes to super volunteer Daz with a whopping 10 things he does for the club each week, all except the ironing! You can also join in the search for Welsh rugby's greatest volunteers, by sending your nomination via twitter to @WRU_Community using the hashtag #FABXV
SSE Swalec Cup kings Pontypridd travelled to Swansea, fully expecting a return to their second home but Llandovery had other ideas as they also sought victory in the semi-final to earn the right to play the final at Principality Stadium