Seamer Atkinson Compounds the English team's Fitness Problems.
'Significant concern' for the touring side after Atkinson goes off with a hamstring injury.
The pace bowler increased the fitness woes of the England squad 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 hamstring after the final ball that he bowled at the MCG.
The touring camp stated Atkinson felt some "soreness" and would spend time on the sidelines in order to be assessed "during the day".
The series decider of the series in Sydney gets underway at the end of the week.
England have previously lost fast bowlers Mark Wood due to knee trouble and Jofra Archer with an abdominal strain during this series.
Matthew Fisher was added to the party to provide backup.
The seamer had a tough time early in the series, taking just three wickets.
He was dropped from the previous Test, only to be brought back for the Boxing Day match in the playing XI.
The county bowler improved at the MCG, bagging two scalps in Australia's first innings, then making 28 while batting as one of just three England players who passed ten runs.
Post a single over late on the first day, he resumed on Saturday morning and had nightwatchman edging to the keeper.
Yet, at the end of his spell, he sent down a change of pace to Travis Head and immediately felt for his hamstring.
Gus Atkinson was recalled for the fourth Ashes Test after being left out of the third.
