The Champions League will return to the top of the European football calendar for the first time in 2018.
With the new format, teams from the top two divisions of each league will play each other in a group stage.
This will be the first season since 2007 that teams from lower divisions will not face each other.
Teams from the lower leagues will be able to qualify through a single-elimination format, with a maximum of six teams in each group stage, with the last two teams advancing to the knockout stages.
Teams are required to have a home advantage of 50% for all group stage games, meaning the better of two sides from each group will advance to the knock-out rounds.
Group stage games will take place in the city of Helsinki and in the country of Finland.
The new format has the benefit of allowing for the addition of two more games in the group stages.
The two remaining games are to be played in the same city.
The teams that advance will face off against each other on June 17-19, the same day the top four teams from each league are due to face off in the Europa League.
The group stages will feature a top-two draw and a bottom-two knockout round.
At the moment, there is still no official date for the 2018/19 Champions League, with only the results of the group stage being announced.
In 2018, UEFA announced that the group phase would take place from May 23-24, which will see the first leg in Helsinki on May 27.