Seamer Gus Atkinson Adds to the English team's Fitness Concerns.
'Major setback' for the English camp after Atkinson leaves the field with a hamstring injury.
The pace bowler increased the injury concerns plaguing England after leaving the field early on day two of the Boxing Day Test against Australia.
Atkinson pulled up with his left hamstring immediately following a delivery in his spell at the MCG.
The touring camp indicated the 27-year-old had experienced "tightness" and was to take time off the field for further assessment "during the day".
The series decider of the tour beginning on 4 January gets underway on Sunday, 4 January.
The visitors have previously lost strike bowlers Mark Wood with a knee problem and Jofra Archer with an abdominal strain on this Ashes tour.
A replacement bowler was added to the party to provide backup.
His form was underwhelming during the first two matches, claiming a mere three wickets.
He was omitted of the third Test, then recalled for the Boxing Day match to fill the void.
The county bowler improved at the MCG, claiming a couple of wickets during the host's first knock, then making 28 as a batsman being one of only three England players to reach double figures.
Post a single over late on the first day, he came back the next day and removed Scott Boland edging to the keeper.
However, on the final ball of his spell, he sent down a change of pace to Travis Head and promptly felt for his hamstring.
Gus Atkinson returned to the side for the fourth Ashes Test after being left out the previous Test.