 After spending two months rehabilitating on his knee, Elphick made his return from injury on 28 April 2018, coming on as a substitute for Omar Richards in the 49th minutes, in a 4–0 loss against Ipswich Town.He started the whole game on the last game of the season against Cardiff City, in a 0–0 draw to ensure Reading's safety in the Championship.At the end of the 2017–18 season, Elphick went on to make 4 appearances for the club.