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From Chris Jones
BBC rugby union correspondent
Despite being struck down with appendicitis while at the same time recovering from his ankle problem that is longstanding, england wing Jack Nowell will travel.
Nowell spent four days in an Italian hospital last week, after having his appendix removed.
However he and the rest of the squad have joined up at their Treviso base.
England stay confident he will be fit to play a role in Japan, with their opener against Tonga on 22 September.
"We have no worries ," said assistant coach John Mitchell.
Mitchell states Nowell"needs a fantastic meal" following his sickness, but has commended his attitude and energy later returning to camp.
"What I really respect about him would be when going through his rehabilitation and the sickness, it does not appear to upset him in relation to the energy he brings to the team," he further added.
"He's a great man and we back Jack."
Nowell has suffered a string of setbacks in his own recovery, and has not played since damaging ankle ligaments from the last in May.
"The ankle is progressing and we expect him to be operating pretty soon," Mitchell added.
"The [appendicitis] does not help but we still have 20 days until the tournament begin and they'll be extremely crucial for him."
Elsewhere, fellow wing Ruaridh McConnochie"includes a shot" of being matched to make his long-awaited debut against Italy in Newcastle on Friday, but middle Henry Slade remains a doubt with his knee issue.
However, Mitchell says it is"no major issue" if some players board the plane to Japan without having played some competitive rugby in their warm-up schedule.
"It is all about handling players and how we train consistently gives us a very good sign of whether a player can deal with the threshold of a Test match," he further added.
Meanwhile, Mitchell states the game is"continuously evolving and changing" with numerous countries falling veteran players from their squads around the eve of the tournament.
England have collaborated together with the likes of Danny Care, Mike Brown and Chris Robshaw, Devin Toner has been missed by Ireland, although Owen Franks has been made by New Zealand, and Wales have jettisoned experienced props Rob Evans and Samson Lee.
"This game is becoming more powerful and faster," he clarified.
"It's not a personal decision on some of these guys but unless you may evolve physically with the demands of the match then you're going to get challenged at any point.
"One thing that this game has always taught me is there's not any location for self-preservation plus it's a challenging environment."
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