The team skipper Ben Stokes is said to be "worn out" but still "fit and ready" to bowl, according to assistant coach Jeetan Patel, even though he did not bowl on the day three of a critical Ashes Test.
Stokes deployed five other bowlers as Australia moved to 271-4 in their second innings, establishing a commanding lead of 356 runs at the venue.
The dynamic player had earlier spent over five hours at the wicket across two days to compile 83 runs in England's initial batting effort.
Throughout his marathon 198-ball innings, the 34-year-old was struck on the head by a fast bowler and suffered muscle cramps. He also required time off the field on Friday after hitting his head on the turf while trying to field the ball.
"He could be a bit tired and just require some time to himself right now," commented Patel.
"From what I understand, he's pretty fit to bowl. I think he's just pretty knackered and he's taken a lot out of himself to reach this point in the game."
Considering his chequered injury past – Stokes has not played a full part in any of England's last four series – any suggestion the star all-rounder might be nursing an issue attracts considerable scrutiny.
Always keen to be in the thick of the action, Stokes' decision not to bowl on Friday was puzzling given it was England's last chance to stay in the Ashes series.
At 2-0 down and requiring a victory in Adelaide to keep their aspirations of winning back the Ashes alive, England had given up a first-innings deficit of 85 runs.
"My understanding is he goes at 100%," said Patel. "If he thinks he can't do it at 100%, I don't think he's going to do it. That's likely where he's at."
The tourists could have stayed within the match by dismissing Australia for approximately 240 in their second innings and had faint chances at 53-2 and 149-4, only for the home team to pull away through Travis Head's unbeaten 142.
Even though England delivered 66 overs, Stokes did not use himself.
"He abstained from bowling but that's perhaps a different discussion with him," said former New Zealand international Patel.
"I'm not entirely sure. We all know he doesn't do anything at 80%. Maybe he thought he was a liability, so he didn't bowl."
The last time Stokes limited his bowling was on the last day of the tied fourth Test against India at Old Trafford in July.
He afterwards missed the fifth Test at The Oval with a shoulder injury.
Stokes has a history of driving himself to its absolute limit, and it was put to Patel that the captain felt he might have risked injury if he pushed himself any further in Adelaide.
England stand on the edge of yet another defeat in Australia, once again probably facing defeat inside the initial three matches of the series.
If the visitors' defeat is completed on Saturday's fourth day, it would mean the outcome of the Ashes has been decided in 10 days – the first and second Tests were over in short periods respectively.
Not since 1921, when Australia needed only eight playing days to win in England, has the winner of an Ashes series been determined so swiftly.
If a first goal is to prolong the game into a final day, England will also have to achieve the greatest run-chase at the Adelaide Oval to keep the series ongoing.
"I still believe there's an opportunity for us," stated Patel. "It won't be easy, we're going to need something magical. I think it's high time we witnessed something special from us."
"Three games in, we've thrown some but absorbed many. It's about time, now we're with our backs to the wall, to fight back fiercely."
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