Champions League draw: What was the problem with the first draw and why did they do it again?

Fiasco engulfed UEFA's Champions League last-16 draw today, after the initial draw was declared void due to a computer error.

The entire draw took place at 11am GMT in Nyon, Switzerland, before draws for UEFA's other competitions the Europa League and Europa Conference League.

However, after concerns were raised, the whole Champions League draw process happened again at 2pm.

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Champions League last-16 draw: Manchester United to face Atletico, Real Madrid get PSG

What was the problem with the first Champions League draw?

The one-line explanation is that Manchester United were mistakenly excluded from part of the draw, meaning that there was no way they could be drawn against Atletico Madrid.

They were then drawn against Paris Saint-Germain, which is widely seen as a tougher fixture.

At which point Manchester United went: "Er, hang on, this ain't right."*

_{*Not a real quote, sadly.}

So what happened with the draw?

This is FourFourTwo's understanding of the process:

For each potential fixture a can team be drawn into, they receive a ball, which unscrews and reveals a piece of paper with their name on it. These are all kept in separate pots, clearly labelled with that team's name. When a fixture is being drawn, one ball from each eligible team is put into a new pot. After that fixture is drawn, the excess balls from that new pot are thrown away.

It's done like this because teams from the same country, or were in a group together, cannot be drawn against each other at this stage.

Chelsea, for instance, finished second in their group so are 'unseeded'. But the 'seeded' teams include Liverpool, Manchester City and Manchester United (all English) and Juventus (who were in the same group), so they can only be drawn against Lille, Ajax, Bayern Munich or Real Madrid. Therefore, it seems, they only have four balls in the 'Chelsea' pot at the beginning.

When Villarreal were pulled out of the unseeded pot, no Manchester United ball should have been placed in the new pot to be drawn as their opponents, as they were in Group F together. When they were, it may have created a Manchester United ball shortage, and they were missed out from the next draw, against Atletico Madrid, for which they would have been eligible.

The computer for the draw wrongly showing on the screen that United were ineligible and that Liverpool were eligible when they shouldn't be. This can be seen on the left of this image, taken from the UEFA broadcast earlier today:

This suggests that the mistake for putting Manchester United in the pot may have been a computer error to start with – that's certainly UEFA's suggestion:

From a viewer's perspective, only the draws featuring Villarreal and Atletico Madrid had obvious errors, but UEFA said that it couldn't confirm that all the fixtures were not subject to a similar problem, voiding the entire draw.

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