Liam Byrne has been appointed as the new shadow minister for the Cabinet Office, the department that houses the Office for Civil Society.
The Birmingham Hodge Hill MP, who turned 40 last week, will shadow Francis Maude, it was announced this afternoon.
Byrne is familiar with the brief, having served as minister for the Cabinet Office for eight months in Gordon Brown's government.
He left the post to become chief secretary to the Treasury, where he famously left a note to his successor after the general election saying "there is no money left".
Tessa Jowell, who had been acting shadow Cabinet Office minister since the general election, has been appointed shadow Olympics minister.
The new shadow civil society minister is expected to be announced early next week.