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Australia will enter the Boxing Day Test against England at the Melbourne Cricket Ground (MCG) with a significantly reshuffled lineup, despite having already secured the Ashes series. Following their 82-run victory in Adelaide, which gave them an unassailable 3-0 lead, Australia have decided to rest captain Pat Cummins and will be without the services of veteran spinner Nathan Lyon due to injury.

Steve Smith is set to return to the captaincy, having recovered from a bout of vertigo that forced him to miss the third Test. Smith had previously led the team to victory in the first two tests of the series. Cummins, who overcame a back issue to play in Adelaide, expressed doubt about his ability to play in Melbourne, prompting the decision to rest him to manage his workload and ensure his fitness for the remainder of the summer.

Nathan Lyon, who recently turned 38, sustained a hamstring injury while fielding during the final day of the Adelaide Test. Cricket Australia has confirmed that Lyon will be sidelined for an extended period and will undergo surgery. This marks another setback for Lyon in Ashes series, after he missed matches in the 2023 series in the United Kingdom due to a torn calf.

Todd Murphy has been named as Lyon's replacement in the squad. The Victorian off-spinner is in line to play his first Test on home soil, having previously featured in overseas matches, including replacing Lyon during the 2023 Ashes series. Murphy's selection ahead of Matthew Kuhnemann indicates the faith the selectors have in his ability to perform in Australian conditions.

Jhye Richardson has also been added to the squad and is in contention to play his first Test in more than four years. Richardson's inclusion offers the Australian pace attack further depth in Cummins' absence. Michael Neser and Brendan Doggett are also in the squad and could be selected to replace Cummins.

With Smith's return to the team, a decision must be made on which batter will make way. Usman Khawaja, who scored a half-century in Adelaide after being called in as a late replacement, and Josh Inglis appear to be the most vulnerable.

Australia have already retained the Ashes, and may be looking to secure a series whitewash. The fifth and final Ashes Test is scheduled to begin on January 3 at the Sydney Cricket Ground.