Northampton Saints' 21-year-old prop Brett Sturgess has been called up to the squad ahead of Friday night's
Zurich Premiership game against NEC Harlequins.
Sturgess, who played his last game for Saints against Bath Rugby last month and scored his debut try against Harlequins during the autumn internationals, has been drafted into the front row following Tom Smith's toe fracture and the absence of Chris Budgen and Matt Stewart, who have been drafted into the Army v Navy game on Saturday.
Sturgess is likely to start Friday's game in the place of Smith, who revealed today that his injury was the result of an epileptic seizure he suffered last week.
Smith, who has suffered from epilepsy for the last 13 years and is a patron of the charity Enlighten Action for Epilepsy in both Edinburgh and Hong Kong, said: "I had a seizure in the night and injured my foot somehow
- I am not sure how it happened, but further investigation revealed I had broken a toe."
He added: "The reason I have decided to say I broke it as a result of the seizure is because I have got a pile of letters at home from children with epilepsy, and I always write to tell them it is not something to hide away or something that should be stigmatised. I guess I am putting my money where my mouth is."
Head coach Wayne Smith has been unable to name a side as he is awaiting late fitness tests on Paul Grayson, Bruce Reihana, Matt Lord and Grant Seely.
The team will be selected on Friday morning from the following squad:
Forwards:
Robbie Morris, Brett Sturgess, Kelvin Todd, Steve Thompson*, Matt Miles, Rob Hunter, Matt Lord, Steve Williams, Mark Connors, Darren Fox, Grant Seely, Budge Pountney (capt) and Andrew Blowers.
Backs:
Nick Beal, Bruce Reihana, Oriol Ripol, Ben Cohen, Jon Sleightholme, Pete Jorgensen, John Leslie, Mark Tucker, Paul Grayson, James Brooks, Matt Dawson, Ian Vass and Johnny Howard.
Props Mattie Stewart and Chris Budgen will line up for the Army in Saturday's Inter Services Championship decider against the Royal Navy at Twickenham.
Scotland international Stewart and Saints teammate Budgen will lead from the front as the Army - 18-13 winners last season - attempt to lift the Babcock Trophy for the first time.
More than 40,000 fans will cheer on their sides at Twickenham. The game will be broadcast live on SkySports2 and watched all over the world by servicemen and women.
The British Forces Broadcasting Service will relay the pictures to ground forces in Iraq and to British ships in the the Gulf, as well as to bases in Germany, Cyprus, Gibraltar, Croatia, Bosnia, Turkey, Norway, Belize, the Falkland Islands and Goose Bay in Canada.
Earlier this month the Army beat the RAF 52-13 at Aldershot after the Royal Navy had beaten the airmen 33-28 at Newbury.
The Navy includes former England wing Spencer Brown and ex-Bristol and Exeter No. 8 Bob Armstrong. Prop Nick Bartlett leads the team.
The Army go into the game as slight favourites and their squad includes four of the Fijian stars - Emosi Naisaramaki, Apolosi Satala, Saula Roko and Alfred Vakacokovanua - who helped them lift the Middlesex Sevens title last summer.
This year the battle for the Babcock Trophy will be the centrepiece of a day of rugby, with the Combined Services under-21 side taking on England Students and the final stages of the National Emerging Schools Festival.
Earlier in the day at Kneller Hall, the Army and Navy women's sides play for the first time at 10am with the longstanding Army v Navy veterans game kicking off at 11.30am.
Babcock are one of the leading suppliers of support services to the forces and their work includes refitting ships, managing military bases and training personnel.
"Twickenham is always a great occasion and the competition and camaraderie shown in the Inter Service Championship makes it a special event as well as, hopefully, a superb game of rugby," said managing director Kevin Thomas.
Tickets to this year's game cost £15 (£7 concessions). You can visit www.ticketmaster.co.uk or book by calling 0870 902000 or by tickets on the day at the stadium.
ARMY: Mal Roberts (Royal Logistics Corps), Emosi Naisaramaki (Royal Scots), Howard Graham (Adjutant General's Corps), Ed Smith (Duke of Wellington's Regt), Bruno Green (Royal Engineers), Dan Coen (Royal Engineers), Gareth Slade-Jones (Royal Artillery), Steve Trethewey (REME), George Kemble (Royal Welch Fusiliers), Mattie Stewart (Princess of Wales' Royal Regt), Andy Smith (Royal Logistics Corps), Ben Hughes (Royal Engineers), Apolosi Satala (Royal Scots), Dwayne Cadwallader (Parachute Regt), Isoa Damudamu (The Highlanders).
Replacements: Dean Cunvin (Royal Regt of Wales), Saula Roko (Royal Gloucester, Berkshire & Wiltshire Regt), Darren Ball (Royal Engineers), Alfred Vakacokovanua (Scots Guards), Denny Delaitamana (Royal Regt of Wales), Chris Budgen (Royal Welch Fusiliers), John Beart (Royal Signals).
ROYAL NAVY (from): Nick Bartlett (Capt, Flying Fox), Andrew Laity (HMS Invincible), George Baird (RAF Cranwell), Simon Burns (HMS St Albans), Dan Parkes (HMS Heron), Ollie Hucker (HMS Brocklesby), Bob Armstrong (CTCRM Lympstone), Will Jerrold (HMS Sultan), Mike Cordner (HMS Raleigh), Owen Salmon (HMS Heron), Roger Readwin (BRNC Dartmouth), Dave Sibson (BRNC Dartmouth), Michael Cox (HMS Inverness), Dave Jones (HMS Newcastle), Matt Parker (FPGRM), Dave Pascoe (HMS Seahawk), Paul Clark (BRNC Dartmouth), James Hearsey (HMS Heron), Neil Williams (CTCRM Lympstone), Andy Crompton (HMS Heron), Simon Channing (HMS Heron), Spencer Brown (Bristol Careers).