However, some observers suggest the staff choices indicate Burnham may moderate the radical policy changes he previously championed.
"This is very much Continuity Keir," said one person briefed on the moves. "These are good, competent people.
But if you expected them to pursue a radically different type of politics, you will be disappointed," they added.
Conversely, an ally of the incoming prime minister defended the strategy and staffing choices.
"We will have a leader at the top who is inherently political and the people he has picked are passionate about driving his vision for radical reform and change," the ally stated.
Burnham must navigate a balance between delivering the deep political changes promised to voters and reassuring financial markets regarding his economic plans.
Policy discussions with civil servants are underway, with announcements planned shortly after Burnham officially takes office on Monday.
Key proposals include exploring public or mutual ownership models for water providers like Thames Water, alongside immediate rent control measures to lower living costs.
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However, some plans may draw criticism from left-wing factions, as Burnham reportedly prepares to permit additional drilling in existing North Sea oil fields.
