The aim of the late-night meeting attended by Chancellor Angela Merkel and President Francois Hollande was to come up with "a final proposal" to present to Athens, according to German daily Die Welt.
But the German chancellor's office said yesterday after the meeting only that the quintet agreed to work together "intensely" in the coming days and would stay in "close contact in the coming days".
According to a diplomatic source, the group did not telephone the Greek premier during the meeting.
The diplomatic push comes as cash-strapped Greece remains locked in tough negotiations with international creditors in a bid to release 7.2 billion euros (USD 7.9 billion) in remaining bailout funds.
More From This Section
A deal has so far proved elusive as the creditors -- the European Union, the International Monetary Fund and the European Central Bank -- are demanding greater reforms in return for the cash, which Greece's anti-austerity government has refused to match.
Merkel, Hollande and Juncker met for scheduled talks earlier Monday but the evening arrivals of Lagarde and Draghi came as a surprise.
The impromptu gathering followed a phone conference Sunday between Merkel, Hollande, Juncker and Tsipras, which Merkel's spokeswoman described as "constructive".
Juncker earlier told another German newspaper that Greece's woes would feature heavily in Monday's Berlin discussions, as he reiterated his opposition to a so-called "Grexit".