The Official Online RBS 6 Nations Store is open. The store has everything you need to get behind your team during the RBS 6 Nations, plus the store is now fully stocked with a much wider range of rugby merchandise.
Simpson’s latewithdrawal sees a call-up for Paul Hodgson of London Irish.
However, there was some good news for Johnson as fly-half Charlie Hodgson and Newcastle prop Jon Golding, who both picked up knocks on Sunday, are fit to travel.
Hodgson, who left the field with blood pouring from a nose injury, and Golding, who was forced off after a blow to the ribs, will be reassessed when the squad arrives in Perth on Tuesday.