England hooker Dylan Hartley needed hospital treatment after suffering bruising to a lung during Saturday's 22-30 defeat to New Zealand at Twickenham.
The 27-year-old Northampton player produced a fine display before being forced off after 50 minutes.
England said in a statement hat Hartley was taken to hospital after the match.
"He was further assessed at Pennyhill Park this [Sunday] morning by the England medical team and has been discharged into the care of Northampton Saints," the statement said.
"Dylan will require a few days’ rest and will be re-assessed by his club’s medical team next week."
New Zealand-born Hartley won his 50th cap for England against the All Blacks.