On 7 October, Barkley scored his first goal for Chelsea in a 3–0 win away to Southampton in the Premier League after a strong start to the season under new manager Maurizio Sarri. He followed that up with a last minute equaliser against Manchester United at Stamford Bridge on 20 October. On 28 October, he scored for the third game running against Burnley at Turf Moor, netting in a 4–0 win. On 15 February 2019, Barkley scored his first European goal as Chelsea beat Malmö 2–1 in their Europa League last 32 first leg tie. He scored again in his second successive Europa League game against Malmö six days later in the second-leg tie at Stamford Bridge. On 29 May 2019, Barkley appeared in Chelsea's 4–1 victory over Arsenal in the 2019 UEFA Europa League Final, coming on as a substitute for Mateo Kovačić.