Taking his place in the number 14 jersey is Jack Nowell, who has recovered from a shoulder stinger injury, with Ben Te'o picked as replacement threequarter cover.
"He (Cokanasiga) is a young player and we don't need to rush him".
"It looks like it is a real privilege for him, as it is for all of us". We'll bring him through carefully and he's got a long career ahead of him.
The Australian added: "We've got a good plan in place for him".
"I've had reasonable experience in doing this and sometimes you let them go, and sometimes you've got pull them back a bit". We just feel it's right for him this week to not be involved in the matchday squad.
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"He'll still learning from being around the squad and will feature heavily in our warm-up games for the World Cup".
'What I do know is that every decision that is made here, no matter how big or small, is always thought about and this will be no different.' Nowell's return is one of four changes to England's starting XV, with Ben Moon, Mark Wilson and Henry Slade also recalled to face Scotland.
Ben Youngs will be making his 85th England appearance to surpass the national record for a scrum-half held by Danny Care.
As a result, Cokanasiga has won the fan vote for the Player of the Round, being selected ahead of England teammate Manu Tuilagi, Welsh duo Hadleigh Parkes and Alun Wyn Jones and Ireland pair James Ryan and Garry Ringrose. "You have three teams who can win it", Jones said. 'When they're blown up to be something they're not, it's hard for them, so that's part of it. Joe's a very good kid, but the media can turn anyone's head.' So, how had Cokanasiga taken the news of his demotion? "I am sure he will do the shirt great justice out there on Saturday", said Youngs.
Jones said there was nothing planned in terms of watching the earlier game.
George Ford rescued England with an 83rd-minute try to secure a 38-all draw with Scotland on Saturday after the Scots had come from 31-0 down to lead 38-31 in one of the most remarkable games in Six Nations history.