Defending champions England Under 20 have named their side to take on Italy in their opening game of the IRB Junior World Championship at the ECO Light Stadium in Auckland on Monday, kick off 06:35 (BST) live on Sky Sports.
Moriarty, a key figure in England's triumphant campaign last summer, starts on the flank with Gloucester team mate Billy Burns named amongst the replacements.
England last faced their Italian rivals in their final game of the U20 Six Nations, winning 52-5, but Head Coach Nick Walshe says that that result will have no bearing on this game.
"We're looking forward to kicking off this campaign, we've been in New Zealand for over a week now - the lads are acclimatised and have trained well. They've taken real ownership and can't wait to get out there.
"We did well against Italy in the Six Nations but that game has gone, we're focused on performing well in this game and kick-starting our JWC. "
Captain Callum Braley added:
"We've enjoyed our first week in Auckland but now it's time to get down to business. We're excited about the next five games - there's pressure on us, but we have to use that to our advantage and perform as well as we can."
England Under 20 starting XV against Italy
15 Aaron Morris (Bedford Blues)
14 George Catchpole (Leicester Tigers)
13 Nick Tompkins (Saracens)
12 Harry Sloan (Harlequins)
11 Nathan Earle (Saracens)
10 Sam Olver (Northampton Saints)
9 Callum Braley (Bristol Rugby, captain)
1 Danny Hobbs-Awoyemi (Northampton Saints)
2 Tom Woolstencroft (Bath Rugby)
3 Paul Hill (Leeds Carnegie)
4 Maro Itoje (Saracens)
5 Tom Ellis (Bath Rugby)
6 Ross Moriarty (Gloucester Rugby)
7 Gus Jones (London Wasps)
8 James Chisholm (Harlequins)
16 Jack Walker (Leeds Carnegie)
17 Alex Lundberg (London Wasps)
18 Biyi Alo (Saracens)
19 Charlie Ewels (Bath Rugby)
20 Joel Conlon (Exeter Cheifs)
21 Henry Taylor (Loughborough University)
22 Billy Burns (Gloucester Rugby)
23 Henry Purdy (Leicester Rugby)
Skipper Billy Twelvetrees led Gloucester Rugby to European glory on Friday evening, scoring the crucial try on a memorable night for the Cherry and Whites. After the game, he paid tribute to his team's performance under pressure in the latter stages as they withstood a ferocious late Edinburgh fightback.
Speaking to GRTV, James Hook admitted that, after a superb opening, Gloucester really had to pass a test of character to hold off Edinburgh and lift the European Rugby Challenge Cup. He paid tribute to his team mates for all their hard work on what was a great day for the club.
Speaking to the assembled media this week, Gloucester Rugby club captain Billy Twelvetrees explains that the squad are ready for the final and that it will be an honour to lead the Cherry and Whites out in the Challenge Cup final.
Gloucester Rugby scrum half Greig Laidlaw will line up against former team mates Edinburgh Rugby on Friday evening, but the focus is firmly on his own roles as the Cherry and Whites gear up for the EPCR Challenge Cup final at The Stoop.
Speaking to the media ahead of Friday evening's European Rugby Challenge Cup Final against Edinburgh, Director of Rugby David Humphreys stressed that his improving Gloucester team will need to perform at their best to prevail against a tough Edinburgh side.
Dan Robson, a second half try scorer in the 42-40 win over Newcastle on Saturday, admitted that Gloucester had started slowly but that the second half comeback showed real character and maintains momentum going into Friday's European final.
Gareth Evans was a first half replacement for the Cherry and Whites on Saturday afternoon, but the back rower's impressive carrying kept the hosts on the front foot when they needed it most to snatch a dramatic comeback win.
After his last ditch try clinched the 42-40 Aviva Premiership victory over Newcastle at Kingsholm on Saturday, Billy Burns told GRTV that all the Gloucester team deserve credit for hanging in there against a Falcons team who really made life tough for the Cherry and Whites.
Argentine Mariano Galarza was a key part of the Cherry and White squad that tasted silverware on Friday night as they lifted the EPCR Challenge Cup at The Stoop, a special night that will live long in the memory of the second row.
Figures released by EPCR following Gloucester winning the European Rugby Challenge Cup on Friday evening show that, unsurprisingly, a number of those wearing Cherry and White showed up well in the various statistical categories.