The Blues travel to London on the back of an impressive 34-18 bonus-point win over English rivals Bristol.

But they will face the acid test at the Stoop when they came up against Dean Richards’ Harlequins.

Quins, after a two-year absence, got off to a difficult start against tournament favourites Stade Francais but will hope to bounce back in style in Pool 3.

Harlequins will see England World Cup stars, Andy Gomarsall and Nick Easter, playing their first match of the season in the home shirt.

The starting XV will only see one change, with David Strettle moving into the centres from his familiar position on the wing. Simon Keogh will take up the number 14 shirt on the wing. Ricky Nebbett and James Percival regain their places back on the bench.

Cardiff Blues Director of Coaching, David Young said, “Harlequins will be a massive test for us, they are a much improved team and getting better week by week. They are a very difficult team to beat at the Stoop, and have turned it into a bit of a fortress. We’ve watched them a lot on DVD and we’ve been impressed by them as a team.”

“I was pleased with Bristol result but we still need to be far more clinical. The try before half time was critical, but we had a lot of opportunities before that which we didn’t score. We won’t get many opportunities on the weekend but we have to make sure that we take them,” said Young.