 In June, Sipley signed a two-year contract with the Manly Warringah Sea Eagles for the 2018/2019 seasons.On 19 May, Toafofoa Sipley made his club debut for Manly Warringah against the Melbourne Storm in the 24-4 win at AAMI Park.Sipley made a total of 4 appearances for Manly in the 2018 NRL season as the club endured one of their worst ever seasons finishing 15th on the table and narrowly avoiding the wooden spoon.