The 2017–18 European Rugby Champions Cup-Challenge Cup play-off was the third play-off for entry into the top-level competition of European Club rugby union, the European Rugby Champions Cup.
Format
Following a break to ease fixture congestion caused by the 2015 Rugby World Cup, the three-team play-off held in 2015–16 was expanded, and a four-team format was announced.[1][2]
The two Pro12 teams each played one of the Premiership or Top 14 sides in a single-leg semi-final, held at the home ground of the non-Pro12 side. The winners of these matches then contested a play-off final, with the winner of this match competing in the 2017–18 European Rugby Champions Cup. The three losing teams all competed in the 2017–18 European Rugby Challenge Cup.[citation needed]
Teams
Four teams competed in the play-off, having qualified as either the highest team from each league that did not already qualify for the Champions Cup, or as the winner of the 2016–17 European Rugby Challenge Cup.[3]
The following teams had qualified for the play-off: