This is clearly not a pitch on which to be playing around at the back. Play the conditions, lads.

Image source, Reuters

Switzerland on the front foot immediately as a long ball is headed down to the feet of Xherdan Shaqiri, who takes a look up and unleashes a shot that is blocked.

Northern Ireland know what is required. Time to dig deep.

We are under way.

Image source, Reuters

West Brom tweet: Our boys all start for @NorthernIreland, external in their World Cup play-off second leg against . Good luck, lads!

But Arsenal are seemingly going continental...

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Keith Gillespie
Former Northern Ireland winger on BBC Radio 5 live

This is what you play football for. You play to play on these big occasions.

Image source, Getty Images

Given it's wet in Switzerland we are asking you for the worst football conditions you have played in. How did you get on? Tweet #bbcfootball.

Craig Stevanato: Huddersfield v Millwall in 2008. So foggy that we were 'politely' asking the Millwall fans where they were as we couldn't see them due to the fog.

Mark Hillman: I played in Slough once. That was pretty bad.

Steady Mark...

Keith Gillespie
Former Northern Ireland winger on BBC Radio 5 live

The players are disappointed with the circumstances the other night. We have to forget that. We have a chance to go out there and put that to bed. We don't want to go out with a whimper.

The senior players have to get the younger players motivated, put an arm around them and tell them to play with belief. Go out and do it.

Listen to Keith, Colin Murray and Alistair Bruce Ball on BBC Radio 5 live now by clicking at the top of this page.

Here come the teams. The Swiss fans have a flag each and boy are they waving the heck out of em.

How are your nerves?

Image source, Reuters

John Southall
BBC Radio 5 live football reporter in Basel

I expected no less here than men dressed as cows carrying cowbells, fans with big pieces of cheese on their heads...it’s a colourful scene in Basel.

Alistair Bruce-Ball
BBC Radio 5 live

Let's look at the maths. Switzerland lead 1-0 so Northern Ireland know a 1-0 win takes us to extra time. If the Swiss score first it's really difficult because I think the crowd will get more up for it.

Image source, Getty Images

In case it comes to this, here is what the official Uefa website has to say about away goals and how they operate in the play-offs...

"If the scores are level over the two matches, away goals will count double. If the teams still cannot be separated, extra time is required; should both teams score the same number of goals during the course of the additional 30 minutes, the away team will go through. If the score is still level, penalties are required."

Karen Fazackerley
BBC Sport Northern Ireland

They're sanding the pitch but rain is still coming down. Hardened NI journos think it should be called off. Me, on the other hand, a hardened Burnley fan whose seen a lot worse at the Turf, says play on!

John Southall
BBC Radio 5 live football reporter in Basel

Well here we go, this is the night that could define the careers of these Northern Ireland players. So these are the reasons to be hopeful.... - The pitch is poor, the rain relentless. That won’t suit the Swiss - Michael O’Neill has made positive changes - The Northern Ireland fans Reasons to be fearful - The Swiss don’t lose here

- Only England have won here in 17 years in qualifying games

- Switzerland have won 11 of their past 12

- Switzerland were dominant at Windsor Park

Reasons to be concerned

- There’s a man dressed as a cow.

Coverage on BBC Radio 5 live is well under way.

Northern Ireland manager Michael O'Neill on Sky Sports: "George Saville came on and did well in Belfast and has in his appearances to date. He has the temperament for this. It is an experienced back four. We have tried to put fresh legs and energy into the team.

"We have to play better than we did at home and higher up the pitch than at home. We have options off the bench but the intention is to stay in the game as long as possible and get ahead.

"This is a massive opportunity that may not come around again for these players. We have to be at our best."

Karen Fazackerley
BBC Sport Northern Ireland

Image source, BBC Sport

Meet Mick, he doesn't quite understand the concept of half-and-half scarves. Even with my pigeon German explanation all I got was a confused look. Never mind, he'd make a fortune in the Premier League - if only he knew eh...

Keith Gillespie
Former Northern Ireland winger on BBC Radio 5 live

The worry is if Switzerland score first. Maybe it doesn't change things too much as we know we will likely need two goals tonight. But the body language would change. We have to stay in the tie for as long as we can. It's possible a defensive error can happen, especially with this pitch tonight so just stay in it.

Image source, Getty Images

Let us not forget that Vladimir Petkovic's side have won 13 of their past 17 matches and are 11th in the Fifa rankings, 12 places above their play-off opponents.

Switzerland only missed out on an automatic place in Russia because they lost their final group game to Portugal, having won all nine of their previous qualifiers.

Switzerland are a good football team.

Image source, EPA

Northern Ireland are aiming to reach their fourth World Cup finals and appear in back-to-back major tournaments for the first time in their history, after turning out at Euro 2016.

In contrast, Switzerland have played in 10 World Cups, including the past three tournaments, and are three-times quarter-finalists.

Image source, Getty Images

As you've seen, it is a bit wet in Basel this afternoon. In keeping with that, why don't you let us know the worst conditions in which you've ever played football. Wind, rain, sleet, hail, snow, hurricane, just let us know what you've tried to kick a ball about in.

You can contact us using the hashtag #bbcfootball on Twitter.