Ireland seems to be "fixated" on a "who-done-it style debate" in relation to banking, instead of studying what other countries have done in similar crises, finance minister Brian Lenihan has said.

In an interview with the Sunday Tribune, Lenihan said we need to look at countries such as Sweden to see what we can learn from them.

"In the Nama debate, the option of doing nothing was not an option. When Sweden had the banking crisis, there was all-party agreement that this banking crisis would have to be parked and managed on an all-party basis."

In contrast, he said, opposition parties here were "briefed by the officials in my Department throughout 2009 about different initiatives that were taken and they went into the house and took up positions which were indefensible in market terms. And they did it again and again. And that's not good for the country."

The minister claimed comments made on the eve of the Nama debate, when "Fine Gael introduced a major ambiguity about whether senior bondholders, senior debt should be honoured", were "irresponsible" and did have an effect on international markets.

He also said the government would be in a position to announce a final figure on the cost of Anglo-Irish Bank by the end of this month, although other analysts believe it could be as soon as this week.