Between them the three teams have won the Heineken Cup four times - Ulster in 1999, Munster in 2006 and 2008 and Leinster in 2009 and the focus is on taking the title back to Ireland once again this season.
BRIAN MCLAUGHLIN (Ulster Coach)
"We are happy with the way we are playing, and delighted to still be unbeaten in the Magners League, but we know the Heineken Cup is going to be a step-up and that we need to get better.
"We know that if you want to succeed in Europe you have to play well away from home. We let slip a great chance of winning in Edinburgh last season before finally getting our first win in the competition on English soil against Bath.
"That was our first away win since 2006 and we know we've got to get something from our games on the road against Bath again, Biarritz Olympique and Aironi Rugby."
TONY MCGAHAN (Munster Coach)
"In this pool, winning at home is the most important thing of all. It is obviously a very tough Pool, but it is not really any different to what has been put in front of us in the last few years.
"We were obviously extremely disappointed to lose to Leinster last weekend, but on the other hand we've picked up 19 points from five Magners League matches and we're top of the table.
"We start with a trip to London Irish and we know they got a massive result first-up last season when they won in Dublin against Leinster. They are sitting on top of the Aviva Premiership after five rounds and all their players seem really up for the game.
"It's going to be a really difficult challenge for us, but that will be the same for every game in our Pool. Toulon have go the best that money can buy and the Ospreys have strength and class across the board."
JOE SCHMIDT (Leinster Coach)
"The last time I was coaching a team that played against Racing Metro we found ourselves 33-0 down at half-time in Paris. We hit back in the second half, but still emerged with nothing from the game.
"I know just how dangerous they can be - they have a massive pack, some excellent finishers out wide and a siege-gun boot if required in
Francois Steyn. And what really caught my eye about their narrow defeat in Toulouse last weekend was that they rested a few key players.
"It's obvious to me they are taking the Heineken Cup very seriously and will looking for a good result against us in Dublin. We know we are in for a very difficult six matches in our Pool and it is vital to get off to a good start."