'Significant concern' for England as Atkinson leaves the field with a hamstring injury.
Gus Atkinson further complicated England's injury problems when he left the playing area on the second morning of the Boxing Day Test against Australia.
The right-arm seamer felt a problem in his left leg after the final ball of the fourth over on Saturday.
Team management stated the 27-year-old felt some "soreness" and was to take time off the field in order to be assessed "over the next few hours".
The concluding match of the series in Sydney starts on Sunday, 4 January.
England have previously lost key quicks Mark Wood due to knee trouble and Jofra Archer with an abdominal strain during this series.
A replacement bowler was added to the party as injury reinforcement.
Atkinson struggled during the first two matches, managing only a handful of scalps.
He was left out of the third Test, only to be brought back for the Melbourne Test in the playing XI.
Atkinson performed better in the fourth Test, bagging two scalps with the ball, then making 28 with the bat among just a trio of English batsmen who passed ten runs.
Following a brief spell late on the first day, he came back for the second day's play and dismissed the nightwatchman edging to the keeper.
Unfortunately, on the final ball of that over, he delivered a slower ball to the batsman and promptly felt at his leg.
Gus Atkinson returned to the side for the Boxing Day Test after being left out the previous Test.
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