Fast bowler Atkinson Compounds England's Fitness Problems.
'Significant concern' for the touring side after Atkinson leaves the field with a hamstring injury.
The pace bowler further complicated the injury concerns plaguing England after leaving the playing area during Saturday's play in the Melbourne Test in the Ashes series.
The right-arm seamer pulled up with his left hamstring post-delivery in his spell on Saturday.
Team management indicated Atkinson reported "discomfort" and was to take time off the field for further assessment "during the day".
The final Test in this Ashes battle in Sydney gets underway at the end of the week.
England have been without fast bowlers one seamer with a knee problem and Jofra Archer because of a side injury during this series.
A replacement bowler was brought into the squad as injury reinforcement.
Atkinson struggled early in the series, claiming a mere a handful of scalps.
He was dropped from the previous Test, then recalled for the Melbourne Test as Archer's replacement.
Surrey's Atkinson improved at the MCG, bagging two scalps in Australia's first innings, then making 28 with the bat among just a trio of teammates who passed ten runs.
Post a single over at the end of day one, he returned for the second day's play and removed Scott Boland edging to the keeper.
Unfortunately, towards the conclusion of the fifth over, he bowled a change of pace to the batsman and immediately felt his left hamstring.
Gus Atkinson was recalled for the Melbourne match following his omission of the third.
