'Significant concern' for England as Atkinson goes off with a hamstring injury.
Gus Atkinson further complicated England's injury problems after leaving the field during Saturday's play in the Melbourne Test in the Ashes series.
Atkinson pulled up with his left hamstring post-delivery that he bowled at the MCG.
The touring camp reported the 27-year-old reported "discomfort" and required time on the sidelines for further assessment "in the coming hours".
The concluding match in this Ashes battle in Sydney starts this coming Sunday.
The English side has been without key quicks one seamer to a knee injury and another paceman to a side strain on this Ashes tour.
Matthew Fisher was brought into the squad as injury reinforcement.
The seamer had a tough time during the first two matches, claiming a mere three wickets.
He was left out from the previous Test, then recalled for the Boxing Day match to fill the void.
Atkinson improved at the MCG, bagging two scalps during the host's first knock, before adding 28 with the bat among just a trio of England players to reach double figures.
After bowling one over late on the first day, he resumed on Saturday morning and had nightwatchman taken by the wicketkeeper.
Yet, on the final ball of that over, he delivered a slower ball to the batsman and promptly felt at his leg.
The English bowler was recalled for the Boxing Day Test following his omission the previous Test.
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