The EU has offered Turkey a plan under which it would resettle more refugees, but only if Ankara establishes new camps and boosts its coastguard to slow the flow of people to Europe, officials said.
Brussels is also ready to give Turkey more money to deal with the burden of 2.2 million refugees under a plan European Commission chief Jean-Claude Juncker presented to President Recep Tayyip Erdogan on Monday.
"It is clear that we need Turkey. The Commission will come to its aid," Juncker told the European Parliament before publicly unveiling the proposals through the commission, the executive of the 28-nation European Union.
EU officials will follow up with a visit to Turkey on Wednesday as they try to finalise the proposals and Migration Commissioner Dimitris Avramopoulos will travel there next week.
Turkey is the main gateway for migrants coming to Europe, with most making the short but dangerous sea crossing to Greece.
Brussels has repeatedly urged Ankara to do more to prevent them leaving.
EU President Donald Tusk, who has led calls to better secure Europe's external borders, said that according to Turkish estimates, another three million potential refugees may yet arrive from the Syrian city of Aleppo and surrounding areas.
Under the "draft action plan" -- which Turkey has not yet formally approved -- the EU will offer Turkey a series of incentives in return for its help in tackling the worst crisis of its kind since World War II.
- 'Stepped up' -
Though the new plan contained no figures, the EU pledged to increase the numbers of refugees it resettles from Turkey, which has taken in over two million Syrian refugees since 2011.
The new resettlement figures would add to the 22,504 Syrian refugees the EU agreed in July to take from camps in Turkey, Lebanon and Jordan.
The Geneva-based International Organization for Migration hailed the plan as a "good step".
"Obviously the needs are so great in the refugee world, with 20 million refugees (globally), plus the numbers that are moving now out of Syria primarily, but also from other parts of the Middle East and Africa also, that clearly the more commitment we have on resettlement the better we are," the IOM's general director William Lacy Swing told AFP.
However, international aid group Oxfam said in a new report Wednesday global efforts to help Syrians both inside and outside their war-torn country have proved "utterly inadequate", singling out Russia and France for particular blame.
"The aid response is faltering due to lack of funds -- or more accurately, the lack of political will to loosen up funds," said Andy Baker, who heads Oxfam's Syria crisis response.
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The European Commission has said it would step up work "on a structured EU-wide approach to resettlement" as well as on tightening existing European schemes to "enable refugees in Turkey to enter the EU in an orderly manner".
The plan would also involve the EU supporting Ankara's efforts to combat people smuggling, "notably reinforcing the Turkish coastguard patrolling and surveillance capacities".
EU officials estimate some 30,000 smugglers operate in Turkey, and the plan calls for dispatching a liaison officer from the bloc's border agency Frontex to help Ankara fight the problem.
In return, Turkey would boost its coastguard's capacities and work more with Greece, its long-term regional rival.
Ankara would also work towards integrating its refugees into broader Turkish society by allowing them access to jobs as well as health and education services, it said.
A priority would be the opening of six new "refugee reception centres" co-funded by the EU, it said. Turkey has in the past rejected the establishment of such centres.
- EU funding -
The EU's plan said funding was available for all the steps involved, and also for renewing promises to mobilise up to one billion euros ($1.1 billion) to help Turkey cope with its Syrian and Iraqi refugees.
Implementation of the plan would speed up the visa liberalisation process making it easier for Turks to travel to Europe, the Commission said.
The plan however made no mention of Turkey's calls for a "safe area" and a no-fly zone in northern Syria where refugees could be kept safe, despite the fact it was discussed in Monday's talks.
Recently, the EU has turned its focus on strengthening its borders and dealing with the problem before it reaches Europe's shores, after months of trying to deal with the huge number of migrants already within the bloc's own frontiers.
Despite opposition from several eastern member states, the EU last month pledged to "relocate" 160,000 asylum seekers to countries throughout the bloc from overstretched Greece and Italy.
The first of those relocations is due to take place on Friday when a group of Eritrean refugees will be moved from Italy to Sweden, the EU said on Tuesday.
African migrants arriving across the Mediterranean in overcrowded boats have mainly headed for Italy.
On Tuesday, 928 people were rescued from boats off the coast of Libya in eight operations involving military ships from both Italy and Spain, the Italian coastguard said.