The Anti-Corruption Commission (ACC) served notices to former state minister for housing and public works Abdul Mannan Khan and his wife Hasina Sultana yesterday.
The anti-graft watchdog asked them to submit their wealth statements within the next seven days.
The commission served the notices in connection with an inquiry into allegations of their ammassing illegal wealth.
During primary inquiry, the ACC officials found inconsistencies between their wealth statements and their sources of income.
In January, the ACC launched preliminary probes against three former ministers, three members of the parliament and three former lawmakers of BNP, Awami League and the Jatiya Party.
The probes were launched over alleged discrepancies in their wealth statements submitted to the Election Commission last year.