Fast bowler Atkinson Adds to the English team's Fitness Problems.
'Major setback' for the English camp after Atkinson is forced off with a hamstring injury.
Gus Atkinson increased England's injury problems when he left the ground early on day two in the Melbourne Test against Australia.
The right-arm seamer felt a problem in his left hamstring after the final ball of the fourth over at the MCG.
Team management indicated Atkinson had experienced "tightness" and would spend time away from the action in order to be assessed "during the day".
The series decider of the series at the SCG starts this coming Sunday.
The English side has previously lost fast bowlers one seamer due to knee trouble and Jofra Archer with an abdominal strain on the current trip.
A replacement bowler was called up as injury reinforcement.
The seamer had a tough time early in the series, managing only three wickets.
He was dropped of the third Test, before being recalled for the Melbourne Test as Archer's replacement.
The county bowler improved at the MCG, taking two wickets during the host's first knock, then making 28 with the bat as one of just three teammates who passed ten runs.
Post a single over in Australia's second innings, he came back for the second day's play and dismissed the nightwatchman taken by the wicketkeeper.
However, on the final ball of his spell, he sent down a variation to Travis Head and promptly felt his left hamstring.
Gus Atkinson returned to the side for the fourth Ashes Test following his omission the Adelaide game.
