McGeorge, who captained the New Zealand under-23 team to Olympic qualification in March, and Hogg, who is on course to appear in a second straight Olympic games, bring New Zealand's OFC Nations Cup squad to a full quota of 23.
However, the All Whites will be without Nelsen for the start of their World Cup qualifying campaign after medical staff at Tottenham confirmed an ankle injury picked up towards the end of the season will see Nelsen out for four weeks.
"I met with the doctors at Spurs while I was in London recently and am fully across the situation with Ryan and where he is at physically,'' New Zealand coach Ricki Herbert said.
"The injury he's has been carrying needs rest and we've not going to do the player or our team any favours by throwing him into the demanding schedule we've got coming up and risking greater long-term damage.
"If he gets the rest and treatment he needs now then we increase our chances of having him for the next stage of qualifying and the Olympic Games.''
Due to club commitments, Dan Keat (LA Galaxy), Chris Killen (Chongqing) and Winston Reid (West Ham) have not been released for the Honduras and El Salvador games, which fall outside of the Fifia international window, with Reid involved in Sunday morning's English Premier League promotion playoff with West Ham and Keat and Killen both involved in league action.
Tony Lochhead (honeymoon) and Rory Fallon (pursuing coaching badges) have been excused for the USA leg while US-based goalkeeper Jake Gleeson is on standby for the Nations Cup but joins the team in the USA.
The team depart on Sunday for Texas where they play El Salvador on May 24 and Honduras on May 27, before travelling to Honiara via Brisbane for the OFC Nations Cup.
There they face Fiji (June 2), Papua New Guinea (June 4) and Solomon Islands (June 6) in Group B with the top two teams from each of the two pools qualifying for the next stage of World Cup qualifying in September, October and March. The winner of June's OFC Nations Cup also qualifies for the 2013 Fifa Confederations Cup in Brazil.
Revised All Whites squad for OFC Nations Cup and USA tour (numbers of caps and goals in brackets)
* OFC Nations Cup only
** USA tour only
Goalkeepers
Jake Gleeson (Portland Timbers; 1/0)**; Glen Moss (Wellington Phoenix; 19/0); Mark Paston (Wellington Phoenix; 29/0)
Defenders
Michael Boxall (Vancouver Whitecaps; 3/0); Ian Hogg (Auckland City; 0/0); Tony Lochhead (Wellington Phoenix; 35/0)*; Winston Reid (West Ham; 10/1)*; Ben Sigmund (Wellington Phoenix; 19/1); Tommy Smith (Ipswich Town; 9/0); Ivan Vicelich (Auckland City; 74/6).
Midfielders
Leo Bertos (Wellington Phoenix; 40/0); Jeremy Brockie (Wellington Phoenix; 25/0); Aaron Clapham (Canterbury United; 5/0); Cameron Howieson (Burnley; 0/0); Dan Keat (Los Angeles Galaxy; 1/0)*; Adam McGeorge (Auckland City; 0/0); Michael McGlinchey (Central Coast Mariners; 11/1); Tim Payne (Blackburn Rovers; 0/0); Marco Rojas (Melbourne Victory; 3/0)
Forwards
Kosta Barbarouses (Alania Vladikavkaz; 5/0); Rory Fallon (Aberdeen; 11/3 )*; Chris Killen (Chongqing; 40/12)*; Shane Smeltz (Perth Glory; 37/17); Chris Wood (West Bromwich Albion; 18/2)
