Head coach Eddie Jones said England “need people who have got a samurai spirit” after naming his squad this week for the Rugby World Cup in Japan.
Jones gave shock call-ups to flanker Lewis Ludlam and uncapped wing Ruaridh McConnochie in the 31-man group.
Gloucester scrum-half Willi Heinz, 32, whose England debut came in Sunday’s win at Twickenham against Wales, is also in the squad, but centre Ben Te’o is not.
“You need guys who are mature, who enjoy life,” said Jones.
“And we’ve deliberately picked a squad like that because it’s going to be an important factor.
“This is an enormous cultural event apart from being a sporting event and you’ve got to be able to cope with the different culture.”
The World Cup runs from September 20th to November 2nd , with Jones naming his squad well before the deadline of September 8th.
England have another warm-up clash against Wales tomorrow in Cardiff.