Paceman Atkinson Adds to the English team's Fitness Concerns.
'Major setback' for the English camp after Atkinson is forced off suffering a hamstring problem.
Gus Atkinson increased the injury concerns plaguing England when he left the field during Saturday's play in the Melbourne Test versus the Australians.
Atkinson pulled up with his left hamstring immediately following a delivery in his spell at the MCG.
The touring camp indicated Atkinson had experienced "tightness" and required time on the sidelines for further assessment "over the next few hours".
The concluding match in this Ashes battle beginning on 4 January begins on Sunday, 4 January.
The English side has been without key quicks Mark Wood due to knee trouble and another paceman with an abdominal strain on the current trip.
Matthew Fisher was added to the party as cover for Wood.
The seamer had a tough time early in the series, managing only three wickets.
He was dropped of the third Test, then recalled for the fourth Test as Archer's replacement.
Surrey's Atkinson performed better in the fourth Test, claiming a couple of wickets during the host's first knock, before adding 28 while batting as one of just three teammates to reach double figures.
Post a single over at the end of day one, he resumed on Saturday morning and dismissed the nightwatchman taken by the wicketkeeper.
Yet, at the end of that over, he sent down a variation to Travis Head and suddenly grabbed for his hamstring.
Atkinson was recalled for the Melbourne match after being left out the Adelaide game.
