'Significant concern' for England after Atkinson goes off suffering a hamstring problem.
Gus Atkinson further complicated England's injury problems after leaving the playing area during Saturday's play of the Boxing Day Test against Australia.
The right-arm seamer felt a problem in his left leg post-delivery that he bowled at the MCG.
Team management indicated the 27-year-old reported "discomfort" and was to take time away from the action to undergo evaluation "in the coming hours".
The series decider in this Ashes battle beginning on 4 January starts at the end of the week.
England have previously lost fast bowlers one seamer due to knee trouble and Jofra Archer because of a side injury during this series.
A replacement bowler was added to the party to provide backup.
His form was underwhelming early in the series, taking just a handful of scalps.
He was omitted of the third Test, then recalled for the Boxing Day match to fill the void.
Surrey's Atkinson showed better form in Melbourne, taking two wickets with the ball, and scoring 28 runs while batting as one of just three teammates to reach double figures.
After bowling one over at the end of day one, he resumed on Saturday morning and removed Scott Boland Scott Boland caught behind.
Unfortunately, at the end of his spell, he sent down a variation to Travis Head and immediately felt his left hamstring.
The English bowler was brought back for the fourth Ashes Test following his omission the Adelaide game.
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