'Serious blow' for the touring side after Atkinson is forced off with a hamstring injury.
Gus Atkinson further complicated England's injury problems when he left the playing area early on day two of the Boxing Day Test in the Ashes series.
The pace bowler experienced discomfort in his hamstring post-delivery in his spell at the MCG.
Team management indicated Atkinson reported "discomfort" and required time off the field in order to be assessed "over the next few hours".
The concluding match in this Ashes battle at the SCG begins on Sunday, 4 January.
England have already lost key quicks Mark Wood with a knee problem and Jofra Archer to a side strain on the current trip.
Matthew Fisher was brought into the squad as cover for Wood.
The seamer had a tough time early in the series, claiming a mere a handful of scalps.
He was left out from the previous Test, before being recalled for the Boxing Day match as Archer's replacement.
The county bowler showed better form in Melbourne, bagging two scalps in Australia's first innings, before adding 28 as a batsman among just a trio of England players who passed ten runs.
After bowling one over late on the first day, he resumed for the second day's play and removed Scott Boland Scott Boland caught behind.
However, on the final ball of the fifth over, he sent down a variation to Travis Head and promptly felt for his hamstring.
Gus Atkinson returned to the side for the Boxing Day Test following his omission the previous Test.
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