The three-year-old disappeared from a holiday apartment in Portugal in 2007.
More than £11m has been spent on the Met Police inquiry, known as Operation Grange, since it began in 2011.
The Home Office said a "similar" level of funding would be granted this year as in 2018/19, when the inquiry was given £300,000.
However, the department said the final decision on the amount would not be made until October.
Detectives have been applying to the Home Office every six months for a grant to continue their work.
