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)
Speaking to the local media this week, back row flanker Jacob Rowan said that he is excited for the challenge at the Ricoh Arena this Sunday, and added that the players know the responsibility is theirs to deliver against the league leaders.
Ben Morgan was on media duty this week, and as Gloucester prepare for Sunday's trip to Wasps, the number eight is looking forward to see Gloucester go toe-to-toe with another of the Aviva Premiership's front runners.
Tom Marshall scored his first Gloucester try in the 31-23 win over Saracens on Friday evening and was named Man of the Match. Talking to GRTV, he praised the forwards for setting the tone on the night.
Matt Scott was on media duty this week, and the Scottish international spoke about the benefit of having a full week of training with his club mates and the determination to get back to performing well against Saracens this Friday evening.
After the disappointment of last weekend's performance at Leicester, Director of Rugby David Humphreys told GRTV that he expects a big response from Gloucester in Friday's Aviva Premiership fixture at home to Saracens (kick off 7:45pm).
Gloucester battled bravely against Wasps on Sunday, but it was a case of taking chances at the Ricoh Arena. Gloucester didn't make the most of theirs while Wasps did, and that proved to be the difference.
Gloucester were competitive for long periods at the Ricoh Arena on Sunday afternoon, but were left to rue a host of missed scoring opportunities throughout as Wasps hit back to earn a 35-22 Aviva Premiership win.
Gloucester's Ciaran Knight made his first start at tighthead prop, Henry Walker made his first appearance as a second half replacement and Alex Seville also featured as England U20s might it three from three in the U20s Six Nations with a 46-0 win over Italy in Darlington on Friday night.