England named their 31-man squad on August 12 and Harlequins centre Marchant was absent from the final list, but head coach Eddie Jones has selected the 23-year-old alongside Piers Francis in the midfield to face Italy in what the head coach has termed "a mix-and-match selection policy".
Ruaridh McConnochie, who was the only uncapped player named in the World Cup squad, will make his debut on the wing for a team that will be captained by Owen Farrell and will once again feature Billy Vunipola.
