The 23rd Heineken Cup team came from France this year because French side Biarritz progressed further than any other English or Italian side last season. Castres benefited from this rule and qualified as the seventh French team in the 2006/07 Heineken Cup tournament.
Castres and Perpignan are joined in Pool 1 by previous champions London Wasps, who won the Heineken Cup final in the Twickenham Stadium in 2004 in memorable fashion with a last minute try against Toulouse. English rugby fans will hope that it is a good omen for Wasps that the 12th Heineken Cup final is set to return to the home of England rugby next May.
Top Italian seed Benetton Treviso as Super 10 champions are the fourth team in Pool 1. This will the Italian's champions tenth year participating in the Heineken Cup tournament.
Expectation for the return of the Heineken Cup final to Twickenham is already building with close to 10,000 tickets already sold for the showpiece match.
Pool 1: Benetton Treviso (Italy), Perpignan (France), London Wasps (England), Castres (France).