Jamie Roberts and Alex Corbisiero will be hoping to prove to the British and Irish Lions management that they are ready to tackle Australia in the crucial third Test.
Roberts has been sidelined since damaging his hamstring in the win over the tour win over the Waratahs while Corbisiero sat out the 16-15 loss to the Wallabies after tweaking his calf in the first Test victory.
However the duo are now back in training and have been taking part in extra sessions in a bid to force their way into contention.
"There are a few boys training on Monday and the rest of the squad have a couple of days off and we'll train Wednesday and Thursday," said assistant coach Andy Farrell.
"Alex Corbisiero and Jamie Roberts will go hard on Monday and, hopefully, will be right for full training on Wednesday."
Captain Sam Warburton is another hoping to be fit for Saturday's showdown in Sydney after the Wales flanker suffered a hamstring injury in the second Test.
However Farrell insists that the Lions cannot afford to pick players who are carrying knocks.
"You've got to make sure that everyone is fully fit and ready to go because you can't carry any passengers whatsoever. That is crucial," he said.
"We've got to have a fully 100 per cent fit and energised team, physically and mentally, to go at the weekend, and selection will definitely look at that."
While some of the Lions are taking part in special sessions to prove their fitness, the rest of the squad will enjoy a couple of days' rest and recuperation in the Queensland resort of Noosa before returning to full training on Wednesday.
And Farrell believes that the refreshed Lions can recover from their disappointing loss in Melbourne to clinch an historic series victory.
"There is absolutely no doubt we can turn this hurt around within a couple of days and get back on the horse," Farrell said.
"I think we all realise there is a fantastic performance in every team and I don't think we've seen a fantastic performance out of this squad yet.
"I think we've seen some very good performances. Hopefully, we will see the best at the last hurdle, come Saturday."
When the Lions return to training, quality of set-piece possession could be high on their agenda following some impressive Australian scrum and lineout work.
"Clean ball is everything from set-piece and to getting some continuity within the game. It was a little bit of a lottery at times, we feel," Farrell added.
"We felt that Mako (Vunipola) had a binding issue from his opposing prop a couple of times, early doors. I think Australia are very streetwise. They were playing the referee, there is no doubt about that.
"They were very smart and I am not complaining at all.
"We got done for coming over their side of the lineout. Did they come over on ours? Of course they did. Did they get on the wrong side of the lineout in coming through the maul? Of course they did.
"But that's the game and they were streetwise and got away with it. Fair play to them."