England head coach is set to experiment with his side by playing George Ford and Joe Marler out of position against Wales in Cardiff this weekend.
Fly-half Ford is set to fill in at scrum-half, while Marler, who usually scrums down at loose-head, will offer front-row cover on the right of the pack.
“We’d like to take three in every specialist [position], but that would leave us short in other positions, so we’ve decided to go with two there at scrum-half and two at tight-head,” said Jones.
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“There are risks involved in it, but there are risks involved in other positions as well. We’ve got contingency in George Ford, who has played a little bit at half-back.
“He’s been doing some training there and he’ll continue to do that.
“Joe Marler prepared for the 2015 World Cup as a third tight-head and we’ve done some preliminary work with him. He’s definitely strong enough to play there.”