Meanwhile Borthwick has defended the decision to bring flanker Tom Curry back into the starting XV, a fortnight after being knocked out against Australia.
It was Curry’s second concussion of the season, while the 26-year-old missed the bulk of last season with a career-threatening hip injury.
"The health and wellbeing of the players is paramount," Borthwick said.
"Post the game against Australia, Tom went through all the protocols, which are very stringent protocols.
"He has had a number of consultations with independent specialists. He is a man who is desperate to play this weekend. I am very confident in the medical and strength and conditioning team we have."