Paceman Atkinson Compounds the English team's Fitness Concerns.
'Significant concern' for England after Atkinson goes off suffering a hamstring problem.
The pace bowler added to the injury concerns plaguing England upon exiting the field during Saturday's play of the Boxing Day Test in the Ashes series.
The right-arm seamer experienced discomfort in his left hamstring after the final ball in his spell during the morning session.
The England team stated Atkinson felt some "soreness" and would spend time on the sidelines to undergo evaluation "during the day".
The concluding match of the series at the SCG gets underway at the end of the week.
England have previously lost strike bowlers one seamer due to knee trouble and another paceman with an abdominal strain on this Ashes tour.
A replacement bowler was added to the party as cover for Wood.
Atkinson struggled early in the series, claiming a mere three wickets.
He was left out of the third Test, only to be brought back for the Boxing Day match to fill the void.
Atkinson improved at the MCG, bagging two scalps in Australia's first innings, before adding 28 with the bat being one of only three England players who passed ten runs.
Following a brief spell late on the first day, he came back for the second day's play and had nightwatchman edging to the keeper.
Yet, towards the conclusion of the fifth over, he sent down a variation to Travis Head and immediately felt his left hamstring.
The English bowler was brought back for the Boxing Day Test after being left out the previous Test.
