Ireland coach Declan Kidney has delayed the announcement of his team to face Argentina this weekend - a match that has assumed a vital importance given the ranking points available.
Kidney has named an extended 28-man squad and will now announce his starting XV on Thursday as injuries, disciplinary issues and the current state of the world rankings - which determine seedings for the 2011 World Cup - all play their part.
Forwards Paul O'Connell and Rory Best have been included for the Croke Park clash despite both players suffering dead legs in Ireland's 22-3 defeat by New Zealand last weekend.
Alan Quinlan also features in the 28, despite being cited for stamping against the All Blacks. His disciplinary hearing will take place in Dublin on Wednesday evening.
"Paul and Rory are doing okay as they continue rehab on their dead legs. They took a limited part in training today," Kidney said.
"Alan is involved in a disciplinary hearing, so we are just trying to give as much time possible for these matters to be cleared up before we confirm the team.
"All three of them have been named in the squad, and the fact that we decided on 28 members shows how competitive the battle for places is heading into this game.
"It also allows us to cover several combinations if anybody is ruled out of the game.
"While we would normally name our team today, the circumstances and importance of the game meant we needed to give ourselves that extra couple of days to consider all the options."
Saturday's match has taken on a whole new dimension following the publication of the latest world rankings by the International Rugby Board.
Ireland must beat the Pumas if they are to retain eighth place in the standings.
Scotland - who are expected to beat Canada this weekend - are ninth, with both teams having one influential match remaining.
With the 2011 World Cup seedings to be announced on December 1, Ireland want to avoid the type of group that contributed to their early elimination last autumn.
Should they drop to ninth, they will be drawn in a pool featuring two top-tier nations - possibly hosts New Zealand and France or England.
Meanwhile, Argentina are trying to hold on to fourth place at the expense of England.
They have beaten Ireland in each of their last three meetings, including the 30-15 World Cup triumph in Paris last September that halted the latter's dismal campaign.
"Nobody is doubting the challenge that faces us this Saturday against another team that is above us in the IRB rankings," Kidney added.
"The fact that both teams have something to play for in terms of those world rankings gives this game even more of a competitive edge.
"Argentina are a team that work and play extremely hard for each other, so they'll no doubt give their best performance of the autumn against us."
Ireland's extended squad for match against Argentina at Croke Park on Saturday, November 22, 2.45pm:
Forwards: R Best (Ulster), T Buckley (Munster), B Casey (London Irish), T Court (Munster), S Ferris (Ulster), J Flannery (Munster), J Hayes (Munster), J Heaslip (Leinster), M Horan (Munster), B Jackman (Leinster), S Jennings (Leinster), D O'Callaghan (Munster), P O'Connell (Munster), M O'Kelly (Leinster), A Quinlan (Munster), D Wallace (Munster).
Backs: T Bowe (Ospreys), G Dempsey (Leinster), K Earls (Munster), L Fitzgerald (Leinster), S Horgan (Leinster), R Kearney (Leinster), G Murphy (Leicester), B O'Driscoll (Leinster, captain), R O'Gara (Munster), T O'Leary (Munster), E Reddan (Wasps), P Wallace (Ulster).

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| Time | Fixture |
|---|---|
| Guinness Premiership | |
| Sunday 22nd November | |
| Guinness Premiership | |
| 15:00 | London Irish vs Newcastle |
| 15:00 | Leeds Carnegie vs Sale |
| 15:00 | Saracens vs Wasps |
| Friday 27th November | |
| 19:45 | Sale vs Wasps |
| 20:00 | Newcastle vs Northampton |
| 20:00 | Worcester vs Saracens |
| Saturday 28th November | |
| 15:00 | Harlequins vs Gloucester |
| 15:00 | Leicester vs Leeds Carnegie |
| 17:35 | Bath vs London Irish |
| Saturday 5th December | |
| 15:00 | London Irish vs Worcester |
| 15:00 | Gloucester vs Newcastle |
| 15:00 | Northampton vs Bath |
| 17:35 | Saracens vs Sale |
| Sunday 6th December | |
| 15:00 | Wasps vs Leicester |
| Saturday 26th December | |
| 14:15 | Bath vs Gloucester |
| 15:00 | Leicester vs Sale |
| 15:00 | Worcester vs Northampton |
| Sunday 27th December | |
| 15:00 | London Irish vs Saracens |
| 15:00 | Newcastle vs Leeds Carnegie |
| 16:00 | Harlequins vs Wasps |
| Friday 1st January | |
| 15:00 | Sale vs Harlequins |
| 15:00 | Saracens vs Leicester |
| Saturday 2nd January | |
| 15:00 | Northampton vs London Irish |
| 15:00 | Leeds Carnegie vs Bath |
| 15:00 | Gloucester vs Worcester |
| Result |
|---|
| Guinness Premiership |
| Saturday 21st November |
| Guinness Premiership |
| Northampton 26 - 17 Harlequins |
| Friday 20th November |
| Worcester 12 - 12 Bath |
| Gloucester 12 - 9 Leicester |
| Sunday 1st November |
| Newcastle 14 - 3 Worcester |
| Wasps 9 - 15 Leeds Carnegie |
| Saturday 31st October |
| Leicester 29 - 15 Northampton |
| Harlequins 9 - 9 London Irish |
| Bath 11 - 12 Saracens |
| Friday 30th October |
| Sale 28 - 23 Gloucester |
| Sunday 25th October |
| Saracens 21 - 15 Leeds Carnegie |
| Saturday 24th October |
| Gloucester 6 - 35 Wasps |
| London Irish 18 - 12 Leicester |
| Northampton 21 - 16 Sale |
| Worcester 22 - 26 Harlequins |
| Bath 16 - 27 Newcastle |
| Sunday 4th October |
| Leeds Carnegie 10 - 26 Gloucester |
| Wasps 20 - 15 Northampton |
| Newcastle 15 - 22 Saracens |
| Saturday 3rd October |
| Harlequins 13 - 11 Bath |
| Leicester 19 - 14 Worcester |
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