Lewis Moody was impressed by England's grit and determination in the win over Scotland but says Ireland will provide a far sterner test.
Eddie Jones has made four changes to the England starting line-up for the showdown with Ireland at Twickenham.
Eddie Jones says Manu Tuilagi should be fit to return against Ireland, while fellow centre Henry Slade will be monitored.
There was mixed news from head coach Eddie Jones for England on the injury front on Thursday.
The RFU distanced itself from a report claiming Rassie Erasmus was being lined up to replace Eddie Jones as England head coach.
England coach Eddie Jones was far from impressed with the behaviour of some Scotland supporters as England regained the Calcutta Cup.
Prop Ellis Genge said "I hope we have shut them up" as he laid into England's critics after they beat Scotland.
Captain Stuart Hogg is confident Scotland can let their rugby do the talking and beat England to retain the Calcutta Cup.
Scotland have resisted the temptation to make sweeping changes for the Calcutta Cup contest with England.
Eddie Jones has rung the changes for England's crucial Calcutta Cup contest with Scotland at Murrayfield.