| Nation |
Qualified teams |
| England |
The best 6 teams in Premiership |
| France |
The best 6 teams in Top 14 |
| Ireland |
The best Irish team in Pro12 |
| Wales |
The best Welsh team in Pro12 |
| Scotland |
The best Scottish team in Pro12 |
| Italy |
The best Italian team in Pro12 |
| Ireland, Italy, Wales or Scotland |
The 3 best teams in Pro12 not yet qualified |
| Any of the 6 nations |
The winner of playoff among the 7th in Premiership, the 7h in Top 14 and the best not qualified in Pro12
Challenge Cup winner, if not yet qualified, gains its competition spot. |