Sinn Féin's housing spokesperson says Dublin City Council has to make it clear that co-living is not needed in the city.
It comes amid reports that a US co-living operator is looking to enter the Irish market next year.
The Irish Times says New York-based firm Common is seeking to operate in Ireland as a build-to-rent company - operating both conventional and co-living apartments.
New co-living developments were to be effectively banned late last year under Government plans.
But Sinn Féin Dublin-Midwest TD Eoin Ó Broin told The Hard Shoulder co-living was not banned outright.
"What the Minister did last year was he left co-living on the planning regulations, but he inserted two changes to those regulations.
"One was what they call the general presumption of rejection: that if anybody put in a co-living application after December... the presumption [was] they would be refused."
However he says there is still a possibility this could go ahead.
"But there was a small chink of light for anybody that was interested in co-living, which stated: If in a revised city or county development plan, a city or county manager and elected members thought that co-living could be permissible in certain locations that could be considered'.
"That hasn't happened yet - Dublin City Council are currently revising their county development plan".
He says the council would have to include a clause that co-living could be permissible in certain areas, for example near technology hubs or universities.
Deputy Ó Broin says authorities should make it clear that such developments are not needed.
"Unless something changes between now and [when] this city development plan is concluded, anybody who applies - the presumption is - that it will be refused.
"But co-living regulations still remain on the planning codes.
"What I would say is Dublin City Council, and particularly [CEO] Owen Keegan, should make it very very clear he has no intention of trying to convince his elected members to make co-living permissible anywhere.
"We don't need it in this city".
But he says even if elected members rejected a co-living proposal, there is another way around it.
"If a manager were to propose such a thing, and if the elected members rejected it... the Office of the Planning Regulator can now step in and make - what are essentially - legally binding recommendations to the manager to amend the county development plan.
"The Minister can make a ministerial order, I doubt any of that it going to happen".