In October 2017, Munster confirmed that then-South Africa Forwards Coach Johann van Graan would join the province in November as their new head coach. In the same month, it was announced that Munster's all-time leading try scorer, Simon Zebo, would leave the province at the end of the season. In Rounds 1 & 2 of the 2017–18 European Rugby Champions Cup in October 2017, Munster drew 17–17 away to Castres before earning a 14–7 win at home to Racing 92. Erasmus and Nienaber left Munster in early November 2017, with the province confirming their departure on 13 November 2017. Johann van Graan's first official game as Munster's new head coach was a 36–19 win away against Zebre in the Pro14 on 26 November 2017. Defence Coach JP Ferreira joined Munster in December 2017. In the December Champions Cup double-header against Leicester Tigers, Munster won 33–10 at home before winning 25–16 away, their first win at Welford Road for 11 years. In doing so, Munster became the first team to defeat Leicester in both games of the double-header since they were introduced in 1999, while the home victory also saw Munster surpass 4,000 points in the competition. In Rounds 5 & 6 of the Champions Cup, Munster lost 34–30 away to Racing 92 before beating Castres 48–3 at home, securing a record 17th quarter-final. Munster beat 3-time tournament champions Toulon 20–19 in the quarter-final after a late Andrew Conway try and conversion from Ian Keatley. In the semi-final, Munster were beaten 27–22 by their French pool 4 opponents Racing 92.