Danaher, a centre, was originally unavailable for the tournament but agreed to fly out after a telephone call from manager Noel Murphy.
Troy Coker, the Australian No 8, pulled a hamstring during training yesterday and could be out for the remainder of the tournament, according to his coach, Bob Dwyer.
He will definitely miss Wednesday's Group A match against Canada in Port Elizabeth, when his place will be taken by Tim Gavin. It is the latest in a run of injuries for the utility forward, who played in the two previous World Cups.
Dwyer said a decision on a possible replacement would only be made later. "We are not yet sure about the extent of the injury. He'll definitely not train for at least a week and it might be even longer. It's a big loss for us and a big disappointment for Troy and consequently the team too," Dwyer said.
Tonga will not appeal against the expulsion of flanker Feleti Mahoni from the tournament.
TONGA (v Scotland, Pretoria, Tuesday): S Tu'ipulotu (Manly, Aus); A Taufa (Wellington Harlequins, NZ), U Va'enuku (Kolofo'ou), P Latu (Vahelotu), T Va'enuku (Kolof'ou); E Vunipola, M Vunipola (both Toa-ko-Ma'afu); S Fe'ao (Queensland, Aus), F Vunipola (Toa-ko-Ma'afu), T Fukofuka (Grammar Old Boys, NZ), W Lose (North Harbour, NZ), P Latukefu (Canberra Royals), I Afeaki (Wellington, NZ), M Otai (Kia-Toa, NZ, capt), I Fenukitau (Queanbayan, Aus).
WESTERN SAMOA (v Argentina, East London, Tuesday): M Umaga (Wellington, NZ); B Lima (Auckland,NZ), T Vaega (Moata's), T Fa'amasino (Vaimoso), G Harder (Te Atatu, NZ); D Kellett (Counties, NZ), T Nu'ualiitia (Te Atatu, NZ); M Mika (Otago, NZ), T Leasamaivao (Wellington, NZ), G Latu (Vaimosa), L Falaniko (M St Joseph's), P Leavasa (Hawke's Bay, NZ), S Tatupu (Aucland, NZ), P Lam (Auckland, NZ), J Paramore (Counties, NZ).
FRANCE (v Ivory Coast, Rustenburg, Tuesday): S Viars (Brive); P Saint- Andre (Montferrand, capt), F Mesnel (Racing), T Lacroix (Dax), W Techoueyres (SBUC); Y Delaigue (Toulon), G Accoceberry (Begles-Bordeaux); L Benezech (Racing), M de Rougemont (Toulon), C Califano (Toulouse), O Brouzet (Grenoble), O Roumat (Dax), A Costes (Montferrand), A Benazzi (Agen), L Cabannes (Racing).
ROMANIA (v South Africa, Cape Town, Tuesday): V Brici (Farul Constanta); L Colceriu (Steaua Bucharest), N Racean, R Gontineac (both Cluj Univ), G Solomie (Timisoara Univ); I Ivanciuc (Stinta Petrosani), V Flutur (Cluj Univ); G Leonte (Vienne, Fr), I Negreci (CFR Constanta), G Vlad, S Ciorascu (Auch, Fr), C Cojocariu (Bayonne, Fr), A Guranescu, T Brinza (Cluj Univ, capt), A Gealapu (Steaua Bucharest).