Seamer Atkinson Adds to England's Fitness Problems.
'Significant concern' for the touring side after Atkinson leaves the field due to a hamstring issue.
The pace bowler further complicated the injury concerns plaguing England when he left the playing area during Saturday's play in the Melbourne Test versus the Australians.
Atkinson pulled up with his left hamstring post-delivery that he bowled during the morning session.
Team management stated the 27-year-old reported "discomfort" and was to take time off the field to undergo evaluation "in the coming hours".
The series decider in this Ashes battle at the SCG starts this coming Sunday.
The English side has been without key quicks one seamer to a knee injury and Jofra Archer to a side strain on this Ashes tour.
Matthew Fisher was added to the party as cover for Wood.
His form was underwhelming in the opening two Tests, managing only three wickets.
He was omitted from the previous Test, before being recalled for the fourth Test to fill the void.
Surrey's Atkinson improved at the MCG, claiming a couple of wickets in Australia's first innings, before adding 28 with the bat among just a trio of English batsmen to get into double digits.
Following a brief spell late on the first day, he resumed on Saturday morning and removed Scott Boland edging to the keeper.
However, towards the conclusion of that over, he delivered a change of pace to Travis Head and promptly felt at his leg.
Gus Atkinson was brought back for the Melbourne match after being left out the previous Test.
