Seamer Atkinson Adds to the English team's Fitness Worries.
'Serious blow' for England after Atkinson goes off with a hamstring injury.
The English seamer increased England's injury problems upon exiting the playing area during Saturday's play of the Boxing Day Test in the Ashes series.
Atkinson felt a problem in his hamstring after the final ball that he bowled during the morning session.
Team management stated Atkinson felt some "soreness" and required time on the sidelines in order to be assessed "over the next few hours".
The concluding match in this Ashes battle at the SCG starts at the end of the week.
England have previously lost fast bowlers Mark Wood due to knee trouble and another paceman with an abdominal strain on the current trip.
A replacement bowler was added to the party to provide backup.
Atkinson struggled early in the series, taking just three wickets.
He was dropped from the previous Test, then recalled for the Melbourne Test as Archer's replacement.
The county bowler performed better in the fourth Test, bagging two scalps in Australia's first innings, before adding 28 with the bat being one of only three English batsmen who passed ten runs.
Post a single over late on the first day, he came back on Saturday morning and dismissed the nightwatchman edging to the keeper.
Yet, towards the conclusion of his spell, he sent down a variation to Travis Head and promptly felt at his leg.
Atkinson was recalled for the Boxing Day Test after being left out the previous Test.
