EU leaders are gathering in Brussels with Brexit the first item on the agenda.

A request from British Prime Minister Theresa May for an extension is the big talking point.

So with just eight days to go until Brexit, what's likely to happen?

Our political correspondent Seán Defoe is in Brussels has been looking at the scenarios.

• The most likely thing to happen is the EU will offer an extension on the condition that the withdrawal deal gets passed in the House of Commons next week.

This is what Donald Tusk has talked about and could be a way of further ramping up the pressure on MPs to support a third meaningful vote on the withdrawal deal next week.

If it passes, the withdrawal date is pushed out until late May to give the UK time to put the necessary legislation in place.

Of course the question then becomes what happens if the withdrawal deal is rejected again. Will the EU allow a no deal Brexit to go ahead next Friday?

• We get a long extension to Brexit. The third meaningful vote fails next week and an emergency summit gets called at which Theresa May looks for months more to sort things.

There's loads of problems with this scenario.

Mrs May isn't likely to be given long enough to see things out by her own party - meaning a possible general election in the UK.

EU leaders don't like it as they're sick of talking about Brexit and want to get onto other issues.

It also means months more of uncertainty for businesses and the markets.

• There's no deal.

The withdrawal agreement fails again and for all the reasons outlined about the EU refusing a further extension to Brexit.

The UK crashes out without a deal and takes the Irish economy off the cliff with it despite EU supports.

• Something completely different.

Enough people have made fools of themselves trying to predict Brexit for me to think something entirely different could come along and upset the apple cart. Who knows anymore.

Reporting by Sean Defoe in Brussels