Captain Dylan Hartley will remain with England this week, rather than be released to play for his club side Northampton.
Hartley, still short of game time following a six-week suspension for a high tackle on Leinster's Sean O'Brien, played for 47 minutes in Saturday's defeat of Wales in Cardiff as England made it two Six Nations wins from two.
Saracens hooker Jamie George, his replacement, performed well, putting Hartley's starting position under scrutiny for the February 26 clash with Italy at Twickenham as England seek a 17th consecutive Test win.
It had been suggested that Hartley should seek to play for Saints in Sunday's Aviva Premiership game at Newcastle to accrue valuable match fitness in a fallow Six Nations week.
However, assistant coach Paul Gustard said: "He's the captain of our team and it's important that he stays with us and trains with us."
James Haskell will also stay with the squad, rather than play for Wasps at Sale on Sunday.
Gustard felt Hartley's performance was improved on the previous week against France and lauded his captaincy role under head coach Eddie Jones.
"A lot goes through Dylan as a conduit to the team. He does it brilliantly," Gustard said.
"He has a great relationship with Eddie. That is clear to see. There is mutual respect there."
Mako Vunipola was not named in this week's 25-man training squad for a camp in central London and is expected to play 40 minutes for Saracens at Gloucester on Friday before coming into consideration.
Bath wing Anthony Watson is now fully fit and re-integrated, while Gustard allayed concerns over Wasps No 8 Nathan Hughes, who required physio after tweaking his knee on Tuesday.
Hartley's Northampton team-mate Courtney Lawes continues to give Jones a selection dilemma of a different kind.
Second rows Lawes, Joe Launchbury and Maro Itoje started against Wales and performed well, while Saracens' George Kruis was a standout performer in 2016.
Itoje was named as blindside flanker, wearing the number six jersey, but such is his scrummaging strength that Jones deployed him at lock, with Lawes on the flank.
Lawes said: "I suppose the only difference between a lock and a six nowadays is the position in the scrum.
"I'm just here to perform to the best of my ability and do what I'm told."
Lawes believes he is in his best form since helping Saints win the 2014 Premiership title ahead of Saracens.
"I really want to see where my potential can take me and find where that limit is," he said.
"(It is about) sustained performance. You can't be the best player in the world for a game and think you're the best player in the world."
It was a word with Jones, early in the Australian's now 15-month tenure, that gave Lawes an added impetus.
Jones wanted the defensively destructive lock to rediscover his ball-carrying ability.
"I wasn't in the place I needed to be when I first met him. And, now, hopefully (I am) getting there," Lawes added.
"Eddie pointed out that that is what he wanted me to do. I had a choice: carry on doing what I was doing and probably not play for England again, or develop my game, again - back to what it was.
"It was very good for me. I needed to push myself more and that's what he made me do.
"It's been much better for my game. It means that I don't have to rely on my defensive game to play well. I can do a lot more than that."
All 10 games of the British and Irish Lions tour to New Zealand will be shown live on Sky Sports, starting June 3 2017.