He also says the issue of Sinn Féin leadership has been discussed
The North's deputy first minister says he believes an all-island investigation in NAMA's Project Eagle could take place and should begin as soon as possible.
Martin McGuinness has also echoed the calls of Arlene Foster for police investigations to be expedited, saying they have been sluggish.
Yesterday the Taoiseach Enda Kenny and opposition agreed in principle that there should be a commission of investigation.
Mr McGuinness says he believes an investigation can proceed.
"All of these are very, very serious matters for the people of Ireland - for all of the people of Ireland - and we need to get to the bottom of it.
"And I think it is very, very welcome that the Taoiseach has now agreed to hold an inquiry.
"And I think there is a responsibility on everybody, north and south, to contribute to that inquiry."
Mr McGuinness also says at some stage in the future, there will be a change in the leadership of Sinn Féin.
But he has joined others in saying he is not interested in the top job.
Yesterday Gerry Adams said there is a secret plan for when he steps down as party president.
And Mr McGuinness says the party is preparing for that.