Forwards Alex Corbisiero and Geoff Parling are on course to return for England against Argentina - but Mako Vunipola has been ruled out of Saturday's QBE International at Twickenham.
Leicester lock Parling missed out on last week's 20-13 victory over Australia after suffering a mild concussion in training four days before the game.
Northampton prop Corbisiero, meanwhile, has been struggling with a knee injury since starring as a late call-up for the British and Irish Lions on their tour down under during the summer.
But England forwards coach Graham Rowntree told Sky Sports News that both men will be available to face the Pumas.
"Both trained this morning," Rowntree said. "Alex had a great session this morning, as did Geoff as well. So yes, they will be available for selection. They made a big impact on training."
Remarkably, the England pack did not miss a tackle against the Wallabies and Rowntree added: "Yes, that shows a real hunger that the guys have instilled into them by a great coach in Andy Farrell, who looks after our defence.
"We were gutsy but more importantly we kept our composure in that game which is very pleasing for a young group of players."
The return of Corbisiero covers for the loss of Vunipola, national boss Stuart Lancaster confirming that the Saracens forward was not available due to a knee problem.
"Mako is unfortunately struggling with a ligament strain to his knee and is not available for selection this week," Lancaster said.
Harlequins' Joe Marler will offer cover for the props from the bench, while Parling's selection means Bath second rower Dave Attwood is among 10 players released back to their clubs.
Hooker Rob Webber is on standby for Saturday as Tom Youngs' wife is expecting their first child.
"There are a couple of changes to the squad with Geoff and Alex back and it's great they are back in the mix," added Lancaster.
"We have named an extended squad as we need a further 24 hours to assess one or two minor niggles in the build-up to the team announcement on Thursday morning."
You can watch England take on Argentina in the second QBE International live from 1.30pm this Saturday on Sky Sports 2