Online advertising company D2 Marketing (ASX:DTO) has warned it expects its FY10 revenue to be at the low end of its previously reported $61.9 million to $68.9 million guidance range.

The company has made significant progress with a corporate restructuring program that has seen it significantly reduce its debt levels, sell or close underperforming non-core assets and make changes to its senior management structure, D2 said in a statement.

But company directors have discovered that there is a “lag effect between the restructuring process and the delivery of improved financial results.”

D2 has not ruled out the possibility that it will miss its guidance range entirely.