Fast bowler Atkinson Adds to the English team's Fitness Problems.
'Major setback' for England after Atkinson goes off with a hamstring injury.
The pace bowler further complicated England's injury problems upon exiting the playing area during Saturday's play in the Melbourne Test in the Ashes series.
The right-arm seamer experienced discomfort in his left hamstring post-delivery in his spell at the MCG.
The England team stated Atkinson had experienced "tightness" and would spend time on the sidelines in order to be assessed "in the coming hours".
The concluding match of the tour in Sydney gets underway this coming Sunday.
England have previously lost strike bowlers Mark Wood with a knee problem and Jofra Archer with an abdominal strain during this series.
Matthew Fisher was called up as cover for Wood.
The seamer had a tough time in the opening two Tests, managing only three wickets.
He was left out for the Adelaide match, only to be brought back for the fourth Test in the playing XI.
The county bowler performed better in the fourth Test, taking two wickets with the ball, then making 28 as a batsman among just a trio of England players to get into double digits.
After bowling one over at the end of day one, he returned the next day and removed Scott Boland 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.
Gus Atkinson was recalled for the Boxing Day Test having missed of the third.