The Wasps wing, who missed England's training camp this week, has a knee injury and could be out of action for a month.

Former England captain Jason Robinson (neck) and Sale teammate Mark Cueto (calf) were also sent back to their club after being assessed by England's medical staff.

Current England skipper Phil Vickery was among those who missed the opening session of the two-day camp because of injuries.

Vickery has an ankle problem but is expected to be on the bench for Wasps against Premiership rivals Worcester on Friday.

England's director of elite rugby, Rob Andrew, said Wednesday he hoped half of Ashton's likely side to play Scotland "will not play too much rugby this weekend", when there will be a full round of Premiership matches.