Sinn Féin's Michelle O'Neill has said she needs "more than just fluffy words" from new Democratic Unionist Party leader Edwin Poots about how the parties could work together in future.
The Deputy First Minister said that she has noted Mr Poots' remarks saying he would deliver on commitments made in the "New Decade, New Approach" deal which restored powersharing last year.
Ms O'Neill said she will hold the DUP leader to that word.
"I want to see more than words, I want to see action. I want to see delivery, I want to see it demonstrated. I need more than just fluffy words," Ms O’Neill said.
Sinn Féin will have to endorse Edwin Poots' nomination of MLA Paul Givan to be the next First Minister, before he can take office.
Once Ms Foster steps down from that role, rules that govern powersharing in Northern Ireland mean there is a seven-day window during which Sinn Féin will have to renominate it's Deputy First Minister and agree to re-enter government with the DUP.
It is possible that Sinn Féin could use this window to secure commitments from the DUP, including to progress long-talked about Irish language legislation.
Ms O'Neill said that Sinn Féin president Mary Lou McDonald would meet with Mr Poots this week.
Newly appointed Economy Minister Paul Frew, who is due to take up his new role on Monday, said that Ms O'Neill needs to sit down with the First Minister designate to coordinate a delivery of the New Decade, New Approach deal.
He said that things like the economy, hospital waiting lists and police numbers are among the things that need to be delivered.
Meanwhile, outgoing Economy Minister Diane Dodds has said she doesn't "resile" from comments she made yesterday about the new ministerial appointments.
Ms Dodds is to lose her position from Monday, when a newly appointed Mr Frew will take over.
The DUP reshuffle was announced by Mr Poots at Stormont yesterday.
Ms Dodds tweeted that it was "regrettable" that the new team "does not match the rhetoric about healing and bringing the party together".
Today, speaking at the announcement of 500 new jobs in Northern Ireland and what is possibly her last media appearance as Minister, she said she "genuinely" wishes Mr Frew the best as he takes up the post.
"I've always said division is very difficult for any political party, it's true also of the DUP. I hope the DUP can come together because the most important thing we can do is drive forward growth and prosperity in the economy and then provide the widest possible platform for those who want to vote for the union," she said.
Ms Dodds said she would "always be an advocate for the union" and seek to get a broad level of support for the union.
When asked if she would be doing this from within the DUP, Ms Dodds replied "yes".