England's Churchill Cup squad in Canada are to be joined by six players from the New Zealand-Australia tour party.
Simpson-Daniel is one of six players on their way to Canada
Paul Volley, Mike Worsley, Tom Palmer, Ben Johnston and Gloucester pair James Simpson-Daniel and Andy Hazell will fly into Vancouver on Tuesday evening.
They will be joined by Phil Greening, who has passed a fitness test on the hamstring injured in last weekend's London Sevens.
Hazell and Simpson-Daniel started Monday's 23-9 victory over New Zealand Maori in New Plymouth with the other four on the bench.
England's Churchill Cup coach Jim Mallinder said: "I'm really looking forward to them joining up with the rest of us.
"They won't be considered for the first game against Canada on Saturday so they will have a bit of time to acclimatise and shake off the jet-lag.
"But they will be considered and play a part next week."
England take on the USA in their second game on 21 June in Vancouver.
Greening, who brings the number of hookers in the party to three alongside Matt Cairns and Andy Titterrell, will also be rested from Saturday's opener.
The kick-off time on Saturday has been put back to 1600 local time (2400 BST) to fit in with Canadian television schedules.