The former secretary general at the Department of Finance, Kevin Cardiff, is expected to give evidence to the banking inquiry next week that could be at odds with some of the evidence already given about what happened on the night of the bank guarantee.

Mr Cardiff was present that night, advising the government.

Responding to leaked reports of his evidence, he told RTÉ News he tried to give a report to the inquiry that contained as much relevant information as possible, in an honest and fair manner.

According to a report in the Sunday Business Post, Mr Cardiff is to give evidence to the inquiry.

He is expected to detail the interaction between then minister for finance Brian Lenihan and then Taoiseach Brian Cowen on the night of the bank guarantee.

He is also expected to detail banks’ interaction in the formulation of the blanket bank guarantee.

Mr Cardiff stressed his proposed evidence was not leaked to media by him.

He said his proposed evidence needs to be read as a whole and not in a piecemeal fashion.

A spokesman for the banking inquiry said the issue of how this information came into the public domain will be considered at a private meeting of the inquiry next week.

Mr Cardiff's evidence runs to more than 400 pages, with what was leaked comprising a small part of that.