Fast bowler Atkinson Compounds the English team's Fitness Problems.
'Serious blow' for England as Atkinson is forced off suffering a hamstring problem.
The English seamer added to the fitness woes of the England squad after leaving the ground early on day two in the Melbourne Test against Australia.
The pace bowler pulled up with his left leg post-delivery that he bowled on Saturday.
Team management reported the 27-year-old felt some "soreness" and was to take time off the field for further assessment "during the day".
The concluding match of the series at the SCG starts at the end of the week.
England have previously lost fast bowlers Mark Wood to a knee injury and Jofra Archer because of a side injury on this Ashes tour.
Matthew Fisher was called up as cover for Wood.
His form was underwhelming in the opening two Tests, claiming a mere a handful of scalps.
He was omitted from the previous Test, before being recalled for the Melbourne Test in the playing XI.
The county bowler improved at the MCG, taking two wickets in Australia's first innings, and scoring 28 runs while batting among just a trio of England players to get into double digits.
After bowling one over in Australia's second innings, he came back the next day and removed Scott Boland taken by the wicketkeeper.
Unfortunately, on the final ball of the fifth over, he delivered a variation to the batsman and suddenly grabbed his left hamstring.
Gus Atkinson was recalled for the Boxing Day Test following his omission the Adelaide game.
