Watch all of this year's RBS 6 Nations matches live on RTÉ Two and RTÉ.ie/sport. Listen to all of Ireland's matches live on RTÉ Radio 1 FM, MW and LW 252.
England will head to Dublin with an injury doubt hanging over World Cup winner Jason Robinson for the RBS 6 Nations Championship showdown against Ireland at Croke Park.
The Sale Sharks winger suffered a neck injury during training in Bath yesterday, prompting a call-up for uncapped Harlequins prospect David Strettle.
Although England say 23-year-old Strettle will join up only as 'precautionary cover,' there are clearly concerns about Robinson, who has already scored three tries in this season's tournament.
He is being treated by England medical staff at the team base and his condition will be reassessed ahead of departure for Dublin.
Robinson, capped 41 times, skippered England on their last Dublin mission two years ago in what looked to have been his final Test match before coming out of international retirement for this season's tournament.
If the 32-year-old is sidelined, then Brian Ashton would probably promote Newcastle back Mathew Tait from replacement duty, although a full Test debut for Strettle cannot be ruled out. But the loss of Robinson would be keenly felt in such a high-octane game.
He has delivered two powerful displays since returning to the side, claiming two scores against Scotland and England's solitary touchdown during their 20-7 victory over Italy.
With Ireland boasting one of the most dangerous back divisions in Europe, Robinson's absence would be tough to overcome as England prepare for arguably the toughest examination of their entire Six Nations campaign.
An England win would probably see them installed as tournament favourites, with fellow title challengers France due at Twickenham on March 11, but their recent record against the Irish is not good.
The hosts, meanwhile, are hoping to reel off a fourth successive victory in the fixture and will be on their guard after losing 17-30 to France on their Croke Park bow a fortnight ago.
England hooker George Chuter said: 'The whole occasion is going to be against us, and it is just important we keep our focus within the tight bubble that is the England squad.
'We need to keep our minds on what we are doing. Saturday will be one of those days you play rugby for. It is a massive occasion against a good team in their own back-yard, and everything is stacked against you.
'We are underdogs, well and truly. There will be 83,000 people in a fantastic stadium, and you can't ask for any more in any sport, let alone my humble sport of rugby union.'
Chuter, who will pick up his ninth cap in the fixture, said: 'Playing for your country is the pinnacle of my profession, and it is great to have had an extended run in the side.
'It is a big jump from club rugby to the international arena, so I guess I am still finding my feet after eight caps. I have been learning and adjusting, and hopefully, I can now start to play my real game.
'I am enjoying the way it is going and the way the team is heading. Despite what happened against Italy, I still think we are coming together as a team and turning into a pretty good unit.'
