What are the rules for Euro 2020?

Thanks for that.

I'll paste the relevant parts in below so that people can refer to it if need be, because it's a fair bit to remember:

How are group placings decided if points are level?

If two or more teams are level on points at the end of the group stage, head-to-head record is used as the first tie-breaker to determine their final rankings.

This is followed by goal difference and goals scored in the matches between the teams in question, followed by goal difference, goals scored, most wins and then disciplinary record across the group as a whole.

However, if two teams that play each other on the final day of the group stage are level on points, goals scored and conceded - and are not level with any other side - a penalty shootout will be used to decide their placings.

For full information on tie-breakers, check out the UEFA website here.

Euro 2020: Tournament preview

How are the four best third-placed teams decided?

The ranking of the third-placed teams follows a similar set of rules to those which determine group placings, except there is no head-to-head record to go on as none of the teams have faced one another in the group stage.

As a result, if teams are level on points the tie-breakers are, in order: goal difference, goals scored, wins, disciplinary record and position in European Qualifier rankings.

Who do the third-placed teams play in the last-16?

In short, each of the four third-placed teams that qualify will play against a team that won their group in the last-16.

UEFA has a pre-determined tournament bracket that changes depending on which four groups provide the best third placed teams, which you can view here.

Teams will not play against a team that they have already faced in the group stage.