In October 2017, it was confirmed that Van Graan would be leaving South Africa to join Irish Pro14 side Munster as their new head coach.

[15] However, after Bath's historic 64-0 loss to rivals Gloucester Rugby near the end of the 2021-22 season, a restructuring of the club's leadership took place.

A 61-29 thrashing of Saracens on the final day saw them edge neighbours and rivals Bristol Bears for eighth in the table and a place in the 2023-24 Champions Cup.

In Europe, Bath reached the knockout stages of the Champions Cup for the first time since 2015, advancing to the Round of 16.

With Bath sitting 3rd in the Premiership with just two games remaining in the regular season, Van Graan signed a new six-year contract with the club, committing his long-term future until the end of the 2029-30 campaign.

[20] In December 2024, he guided Bath to 68–10 demolition of Saracens inflicting them with their worst defeat in Premiership history.