Gloucester Rugby and London Irish's second leg of their all-English double-header at Kingsholm already looks like being the defining game of what has been an intriguing Pool.
Gloucester top the table but they are only two points ahead of the Exiles and there is everything to play for when the sides meet for a second time in a week in the west Country.
The Cherry and Whites' rising star Freddie Burns proved he is one to watch with his personal show in their 29-22 victory over their Premiership rivals at the Madejski Stadium.
Gloucester will be seen as many as favourites to reach the knock-out stages, having home advantage for return tie, but London Irish know they simply have to win to keep their own hopes alive beyond Saturday afternoon.
Mont-de-Marsan will be looking to do their own double over French rivals Bordeaux-Begles when they meet them on their home patch at the Stade Guy Boniface.
