Fast bowler Atkinson Adds to the English team's Injury Worries.
'Significant concern' for the English camp after Atkinson goes off due to a hamstring issue.
Gus Atkinson increased England's injury problems upon exiting the ground early on day two of the Boxing Day Test against Australia.
The pace bowler pulled up with his left leg after the final ball in his spell during the morning session.
The touring camp reported Atkinson reported "discomfort" and would spend time on the sidelines for further assessment "in the coming hours".
The series decider of the tour beginning on 4 January starts on Sunday, 4 January.
The visitors have been without key quicks Mark Wood with a knee problem and Jofra Archer because of a side injury on this Ashes tour.
Matthew Fisher was brought into the squad as cover for Wood.
The seamer had a tough time early in the series, managing only a handful of scalps.
He was left out for the Adelaide match, only to be brought back for the Boxing Day match in the playing XI.
The county bowler improved at the MCG, taking two wickets in Australia's first innings, then making 28 as a batsman as one of just three English batsmen who passed ten runs.
After bowling one over late on the first day, he came back for the second day's play and removed Scott Boland taken by the wicketkeeper.
Unfortunately, towards the conclusion of that over, he delivered a variation to Travis Head and suddenly grabbed at his leg.
The English bowler was brought back for the fourth Ashes Test having missed of the third.
