Amor and the RFU have mutually decided to part company, while Ryles has decided to stay in Australia with his family due to the COVID-19 pandemic.
After winning the Six Nations and Autumn Nations Cup in 2020, England have suffered a severe slump in form in recent months and finished fifth in the Six Nations, which led to an in-depth RFU review.
The review was completed last month with the RFU standing by Jones, who has a contract through to the 2023 World Cup in France.
