Five English teams and eight French teams competed because an English team – Leicester Tigers – progressed farther in the 2008–09 Heineken Cup than any French or Italian team.
Other countries will have their usual number of teams: Ireland one, Romania one and one from Spain.[3]
The draw for the pool stages took place on 15 June 2009. The seeding system was the same as for the 2008–09 tournament. The 20 competing teams were ranked based on past Heineken Cup and European Challenge Cup performance, with each pool receiving one team from each Tier.[5] The requirement to have only one team per country in each pool was, however, still apply (with the exception of the inclusion of the sixth, seventh and eight French teams).
Beginning with this season's competition, only the pool winners advanced to the knockout stage. They were joined by three clubs from the 2009–10 Heineken Cup, specifically the third through fifth highest-ranking teams that finished second in their pool (the top two second-place teams entered the Heineken Cup knockout stage).[6]
Team seedings
Seeding was determined by the teams' position in the ERC Rankings at the time of the pool draw in June 2009.
On 28 April 2010, the competition organiser, European Rugby Cup, announced that the final would be held on 23 May. The time was set at 13:00 UTC (14:00 BST, 15:00 CEST), but the location would depend on the result of the Connacht–Toulon semi-final. Since Toulon won, the final was held at Stade Vélodrome in Marseille.[13]
Cardiff Blues were designated as the home team for the final. However, it was an effective home game for Toulon; Stade Vélodrome hosted two of that club's matches in their domestic season. Cardiff Blues won the final against Toulon by 28–21.[14]