Fast bowler Gus Atkinson Adds to the English team's Fitness Concerns.
'Major setback' for the English camp after Atkinson is forced off with a hamstring injury.
The English seamer added to the injury concerns plaguing England upon exiting the playing area early on day two of the Boxing Day Test versus the Australians.
The pace bowler pulled up with his hamstring immediately following a delivery that he bowled on Saturday.
The England team indicated the 27-year-old felt some "soreness" and required 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 visitors have already lost strike bowlers Mark Wood to a knee injury and another paceman with an abdominal strain on the current trip.
Matthew Fisher was called up to provide backup.
Atkinson struggled during the first two matches, taking just three wickets.
He was left out from the previous Test, then recalled for the Boxing Day match as Archer's replacement.
Atkinson showed better form in Melbourne, bagging two scalps with the ball, then making 28 with the bat among just a trio of England players who passed ten runs.
Following a brief spell late on the first day, he returned for the second day's play and had nightwatchman edging to the keeper.
Yet, on the final ball of his spell, he sent down a slower ball to the batsman and suddenly grabbed for his hamstring.
Atkinson was recalled for the fourth Ashes Test having missed of the third.
