Fast bowler Atkinson Adds to England's Fitness Worries.
'Serious blow' for the touring side as Atkinson is forced off due to a hamstring issue.
The English seamer increased England's injury problems after leaving the playing area on the second morning in the Melbourne Test versus the Australians.
The right-arm seamer experienced discomfort in his left leg after the final ball that he bowled during the morning session.
Team management reported the 27-year-old had experienced "tightness" and required time away from the action for further assessment "in the coming hours".
The final Test in this Ashes battle at the SCG begins on Sunday, 4 January.
The visitors have been without fast bowlers one seamer due to knee trouble and another paceman with an abdominal strain during this series.
Matthew Fisher was added to the party as cover for Wood.
His form was underwhelming early in the series, claiming a mere three wickets.
He was dropped from the previous Test, then recalled for the fourth Test in the playing XI.
Surrey's Atkinson performed better in the fourth Test, taking two wickets during the host's first knock, before adding 28 while batting among just a trio of England players to get into double digits.
Post a single over in Australia's second innings, he resumed the next day and removed Scott Boland taken by the wicketkeeper.
Yet, at the end of his spell, he bowled a variation to the batsman and immediately felt for his hamstring.
Gus Atkinson was brought back for the fourth Ashes Test after being left out the previous Test.
