The Champions League operates as a knockout competition, with a final group stage, with each tie (including the final) played over two legs – home and away. There are 2 knockout stages: the preliminary stage and the first round (32 teams). The 16 teams knocked out of the first round are entered into the Confederation Cup to play against the final 16 teams in that competition. After the first round, the last 16 teams are split into four groups of 4. The winner and runner-up in these groups are sent to play in a quarter-final and the possibility to play semi-finals, in chase of victory, for the chance of contesting the final.