Alex Mitchell out of England's Nations Championship opener with hamstring injury

England scrum-half Alex Mitchell has been ruled out of Sunday's Nations Championship opener against Australia with a hamstring injury.

• Mitchell damaged his hamstring in Northampton's Premiership win over Gloucester on Saturday and will undergo a scan to determine the extent of the injury.
• Head coach Steve Borthwick called Bristol's Harry Randall and Bath's Ben Spencer into the squad, with either set to bench and Leicester's Jack van Poortvliet expected to start at No 9.
• Uncovered clubmate Archie McParland is also sidelined for the Australia match after sustaining a calf injury in England's training camp last week.
• Gloucester centre Seb Atkinson and Exeter wing Immanuel Feyi-Waboso were named in the 36-man squad after injury comebacks; Bath's Kepu Tuipulotu dropped out injured.