German Chancellor Angela Merkel has suggested an alternative to the Irish border backstop - a key Brexit sticking point - could be found within 30 days.
Speaking at a news conference alongside Prime Minister Boris Johnson in Berlin, she stressed it would be up to the UK to offer a workable plan.
The PM said he was "more than happy" with that "blistering timetable".
He accepted the "onus" was on the UK, but said he believed there was "ample scope" for a new deal to be reached.
In his first overseas visit to a fellow leader, Mr Johnson is meeting Mrs Merkel after he told the EU the backstop - which aims to prevent a hard Irish border after Brexit - must be ditched if a no-deal exit was to be avoided.