The European Commission is set to declare on Wednesday, May 4, that Turkey has broadly met the criteria for early visa liberalisation in a blaze of last-minute legislation and ask EU governments and the European Parliament to approve the decision by the end of June, several EU sources said, EurActiv wrote.

"We have not lowered our standards. Turkey has raised its game," a senior EU official familiar with the negotiations said.

He was seeking to explain how the EU executive could certify compliance after telling lawmakers just two weeks ago that Ankara had met fewer than half the so-called benchmarks.

The political reality is that Brussels cannot say "No" and risk a collapse of a much criticised March 18 EU-Turkey deal that was a turning point in Europe's refugee crisis.

"It may lack political support to sustain a 'Yes,' but the Turkish government won't take 'Later' for an answer," EuroActiv wrote.

So in the time-honoured EU manner, the Commission will present a package aimed at offering something for everyone.

EU officials insist the union made no promise, and the offer applies only if Turkey meets 72 legal and technical conditions.

The Commission reported this month that Ukraine and Georgia had met those benchmarks, and will add Kosovo on Wednesday.

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Read alsoTurkey to cancel deal on migrants if EU doesn't keep its wordTurkish officials warn against any anti-Muslim discrimination.

"This is a great opportunity for Europe to show it is a reliable partner and make it clear that they don't apply double standards when it comes to predominantly Muslim European nations such as Turkey," a government official in Ankara said.