On 23 August 2015, Morrison scored both of West Bromwich Albion's goals in a 2–3 home defeat to Chelsea, the first two-goal haul of his career and an equalling of his goal tally for the previous season. Earlier in the game, he had a penalty saved by Thibaut Courtois. On 30 June 2016, Morrison signed a new two-year deal with West Brom keeping him at the club until at least the summer of 2018 with a one-year option. He further extended this on 3 August 2018, keeping him at the Hawthorns until 2019. He left the club after the 2018–19 season, with his final appearance coming in a play-off match against Aston Villa.