Meanwhile full-back Furbank is recovering from fracturing his arm in Northampton’s Champions Cup win over the Bulls in December.
“He is going well,” said Borthwick of Furbank. “He had [another] X-ray on his arm last week and we are waiting on the specialist to give his view on that.
“Hopefully he might be available at the end of the tournament but we are still waiting for the specialist’s report.”
England will attempt to end Scotland’s four-match winning streak in rugby’s oldest international fixture when the two teams meet at Twickenham on 22 February.
Borthwick’s side continue their campaign at home against Italy on 9 March before travelling to Wales on 15 March in the final round.
Ollie Sleightholme has deputised for Feyi-Waboso so far in the tournament.
Freddie Steward played 15 in the defeat by Ireland, before Marcus Smith shifted from his usual fly-half role to play full-back in Saturday’s win over France.
