The debt draw down would be after the equity has been invested, likely by mid-2012, according to an investor presentation on its website, adding there would be a "significant upfront cost."
London Gateway is a staged 1.5 billion-pound ($2.3 billion) development embracing the container port itself as well as what is expected to be Europe's largest logistics park.
DP World said this week it would invest another $1 billion on the port over the next three years.
The company's group capital expenditure programme was also revised higher to $2.7 billion to include additional London Gateway investment.
An additional $600 million was added, with the spending split between 2013 and 2014. The majority will come in 2013.
DP World is considered one of the more profitable units of debt-laden Dubai World , which reached a near $26 billion debt deal with creditors last year.