BRUSSELS, March 20. /TASS/. Three is a possibility British Prime Minister Theresa May will ask for a postponement of UK’s withdrawal from the European Union at the EU summit on March 21, an EU source in Brussels told the media on Wednesday. The current Brexit date is March 29.

"We’ve not received a request from Britain yet. Possibly we will have it [before the summit]. Or not. At least London has such an intention (to ask for a Brexit delay - TASS). Prime Minister May can do this tomorrow, during a meeting with the leaders," he said.

The diplomat said the current situation was that of complete uncertainty, which was well seen in the fact that EU President Donald Tusk had not yet sent a traditional message to the leaders of the 27 EU member-states. Usually such a message is sent out two days ahead of a summit to let the participants know the agenda and priorities to be discussed.

"We are not the cause of this uncertainty. But you can be sure that Tusk’s letter will follow today," the diplomat added.

As Downing Street 10 said earlier, a request for a Brexit delay, addressed to EU President Donald Tusk is to be sent before March 21, when Brussels will host a two-day scheduled meeting of the EU heads of state and government. Article 50 of the Lisbon Treaty allows for extending the two-year deadline an EU member-state has to meet for leaving the community, if that initiative is approved of the European Council.