Hartley was replaced in the 52nd minute by Tom Youngs after sustaining the injury while making a tackle and was taken to hospital before being discharged
The 27-year-old was assessed by England's medical team on Sunday morning and has returned to his club Northampton.
"Dylan has been discharged into the care of Northampton," a Rugby Football Union statement read.
"Dylan will require a few days' rest and will be reassessed by his club's medical team next week."
- Sports & Recreation
- Tom Youngs