Seamer Atkinson Adds to the English team's Fitness Concerns.
'Significant concern' for the touring side after Atkinson leaves the field with a hamstring injury.
The pace bowler further complicated the fitness woes of the England squad upon exiting the field early on day two in the Melbourne Test versus the Australians.
The right-arm seamer pulled up with his hamstring immediately following a delivery in his spell on Saturday.
Team management stated Atkinson reported "discomfort" and required time off the field to undergo evaluation "in the coming hours".
The series decider of the series at the SCG gets underway this coming Sunday.
The English side has previously lost fast bowlers Mark Wood to a knee injury and Jofra Archer because of a side injury on this Ashes tour.
A replacement bowler was added to the party to provide backup.
Atkinson struggled early in the series, managing only three wickets.
He was omitted from the previous Test, only to be brought back for the Boxing Day match to fill the void.
Surrey's Atkinson performed better in the fourth Test, taking two wickets in Australia's first innings, before adding 28 as a batsman as one of just three English batsmen to reach double figures.
Post a single over late on the first day, he came back for the second day's play and removed Scott Boland taken by the wicketkeeper.
Yet, on the final ball of the fifth over, he sent down a slower ball to Travis Head and suddenly grabbed at his leg.
The English bowler was recalled for the Boxing Day Test following his omission the previous Test.
