Dallaglio, who retired from professional rugby at the end of last season following three tours as a Lion, will be joined by fellow three-times tourists Martin Johnson, Richard Hill and Will Greenwood, as well as 1997 hooker Mark Regan, 2001 wing Dan Luger and 2001 and 2005 star Jason Robinson.
Joining Welshman Gibbs, himself a Lions tourist on three occasions, are countrymen Darren Morris and Colin Charvis, who both toured with the Lions in 2001, Scottish international Gordon Bulloch who featured in 2001 and 2005 and Ireland's Shane Byrne, a Test starter in New Zealand three years ago.
Another Lions legend, Ieuan Evans, will be acting as manager for the International XV, with ex-England skipper Phil de Glanville taking on the same role with the Help for Heroes squad.
All Black superstar Jonah Lomu is also set to feature, as are Samoan No8 Zak Feaunati and Wigan rugby league great, Martin Offiah.
The match, which aims to raise £1 million to aid those members of the Army, Navy or Royal Air Force recovering from injury sustained on active duty, kicks off at 2.30pm this Saturday.
Tickets are available in advance from Ticketmaster on 0844 847 2492 or at www.ticketmaster.co.uk until 1pm on Friday September 19 and are priced from £20 for adults and £10 for juniors, with a family ticket costing £50.
Tickets will also be available on the day from the South Stand ticket office.
Help for Heroes XV
15. Mal Roberts (Army)
14. Mark Odejobi (London Wasps)
13. Will Greenwood (England)
12. Jason Robinson (England)
11. Dan Luger (England)
10. Alex Goode (Saracens)
9. Joe Simpson (London Wasps)
1. Nathan Catt (Bath Rugby)
2. Mark Regan (Bristol Rugby, England)
3. Tom Mercey (Saracens)
4. Rob Sugden (Army)
5. Scott Hobson (Bath Rugby)
6. Matthew Cornish (Royal Air Force)
7. Richard Hill (England)
8. Lawrence Dallaglio (England, captain)
16. Martin Johnson (England)
17. Tom O'Keeffe (Royal Marines)
18. Richard Matthews (Royal Air Force)
19. Paul Volley (London Scottish)
20. Martin Offiah (Wigan Warriors, Great Britain RL)
21. Dave Pascoe (Royal Navy)
22. Dominic Shabbo (London Irish)
23. Gareth Leonard (Royal Air Force)
24. Henry Barratt (London Wasps)
15. Justin Bishop (Doncaster Knights, Ireland)
14. Kristian Phillips (Ospreys)
13. Angelo Flammia (Royal Air Force)
12. Scott Gibbs (Ospreys, Wales, captain)
11. Kenny Logan (London Wasps, Scotland)
10. Rhys Priestland (Llanelli Scarlets)
9. Guy Easterby (Otley, Ireland)
1. David Hilton (Bristol)
2. Gordon Bulloch (West of Scotland, Scotland)
3. Darren Morris (Worcester Warriors, Wales)
4. Gareth Llewellyn (Wales)
5. Howard Parr (Royal Air Force)
6. Dafydd Jones (Llanelli Scarlets, Wales)
7. Colin Charvis (Newport-Gwent Dragons, Wales)
8. Joe Kava (Army)
16. Shane Byrne (Saracens, Wales)
17. Shaun Ruwers (Worcester Warriors)
18. Marsh Cormack (Royal Navy)
19. Mark Lee (Army)
20. Zak Feaunati (Bath, Samoa)
21. Micky Young (Newcastle Falcons)
22. Matt Rhodes (Royal Marines)
23. Dafydd Hewitt (Cardiff Blues)
24. Jonah Lomu (North Harbour, New Zealand)