Speaking in his country’s parliament on Tuesday, Irish prime minister Leo Varadkar welcomed Mr Johnson’s comments.
“I very much welcome Prime Minister Johnson’s words today when he disowned and distanced himself from those non-papers,” he said.
“Had he not, in my view, it would have been hard evidence of bad faith on behalf of the British government.”
Earlier, Ireland rubbished the plan reported by RTE, with foreign minister Simon Coveney calling it a “non-starter”.
“Time the EU had a serious proposal from the UK Govt if a #Brexit deal is to be achievable in October. NI and IRE deserves better!” he tweeted.
And an Irish government spokesperson said they had yet to see “any credible alternatives” to the current backstop.
They said: “The EU taskforce has indicated that any non-papers it has received from the UK to date fall well short of the agreed aims and objectives of the backstop.
“The UK’s non-papers were given to the taskforce on the strict understanding they would not be shared with anyone. The taskforce has said it has received no credible proposals from the British.
“Ireland’s priorities are protecting the Good Friday Agreement, avoiding a hard border and protecting the all island economy, and protecting the EU single market and its benefits for Irish businesses and consumers.
“We have yet to see any credible alternatives to the backstop.”