Paceman Gus Atkinson Compounds England's Fitness Worries.
'Serious blow' for England after Atkinson is forced off suffering a hamstring problem.
The English seamer added to England's injury problems when he left the ground during Saturday's play of the Boxing Day Test against Australia.
Atkinson pulled up with his hamstring immediately following a delivery in his spell during the morning session.
Team management indicated Atkinson had experienced "tightness" and would spend time off the field for further assessment "in the coming hours".
The series decider of the tour beginning on 4 January gets underway at the end of the week.
England have been without fast bowlers one seamer to a knee injury and Jofra Archer to a side strain on this Ashes tour.
A replacement bowler was called up as injury reinforcement.
The seamer had a tough time during the first two matches, taking just three wickets.
He was omitted from the previous Test, only to be brought back for the fourth Test to fill the void.
Surrey's Atkinson showed better form in Melbourne, taking two wickets during the host's first knock, then making 28 as a batsman being one of only three England players to get into double digits.
Post a single over late on the first day, he returned for the second day's play and removed Scott Boland edging to the keeper.
Yet, at the end of his spell, he sent down a slower ball to the batsman and promptly felt at his leg.
Atkinson was brought back for the fourth Ashes Test following his omission the previous Test.
