Less than a month after Eddie Jones left as England's head coach, Matt Proudfoot left his position as forwards coach.
Proudfoot became the forwards coach in January 2020 after Neal Hatley left to join Bath.
He was an assistant to the World Cup winning South African team.
"We are very grateful to Matt for all he has done for England and wish him good fortune in his next career move," said O'Shea.
Proudfoot said it had been an honor to work with the England team.
The appointment of Borthwick as England head coach was made on December 19th.
The process of replacing Jones after the World Cup was brought forward after some poor results for England, including defeats to Argentina and Scotland.
The RFU said that the England coaching team had lost two members.
During the Autumn Internationals, Jones made the appointment of Hodgson as England's coach, but he never actually took the job.
Kevin Sinfield is the new defence coach for Borthwick.