It took an extra 12 months of waiting, but Euro 2020 is finally underway as UEFA look to crown new European Champions for the first time since 2016.

Six groups of four teams will see 24 teams compete for the right to progress to the knockout stages, with the top two teams in each group qualifying automatically. The four best third-placed teams will also progress to make a round of 16 stage, meaning eight teams will be eliminated at the first hurdle.

But if teams are level on points at the end of the three games how do UEFA plan on separating them? We've got you covered. Here's everything you need to know.

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According to tournament rules, goal difference will be the ultimate separator between sides tied on points throughout the group stages. However, if two teams happen to have the same goal difference too, then head-to-head results between the teams tied will be the differentiator.

While that seems unlikely on the face of it, that is exactly what happened in during Euro 2016. Italy and Belgium battled to a stalemate in Group E back then, finishing level on points and goal difference. That meant that Antonio Conte's sides 2-0 win over Belgium during that group stage saw the Azzurri qualify to the next round as group winners, while Belgium went through as runners-up.

Ultimately it was also the reason that Portugal got out of their group too.

Cristiano Ronaldo's side drew all three group games against Iceland, Hungary and Austria which saw them finish on three points with a goal difference of zero.

However while the Republic of Ireland and Slovakia progressed as two of the best third-placed teams on four points, all of Turkey, Albania and Northern Ireland also finished on three points.

In the end it was Portugal and Northern Ireland that went through with a goal difference of zero, since both Turkey and Albania had a -2 goal difference.

That was crucial as Portugal eventually went on to win the tournament, thanks to Eder's long-range winner in extra-time against France.