[3] Below are the 32 teams which participated in the knockout phase (with their 2018 UEFA club coefficients, which take into account their performance in European competitions from 2013–14 to 2017–18 plus 33% of their association coefficient from the same time span).
The team that scores more goals on aggregate over the two legs advanced to the next round.
If no goals were scored during extra time, the tie was decided by penalty shoot-out.
In the final, which was played as a single match, if the score was level at the end of normal time, extra time was played, followed by penalty shoot-out if the score remained tied.
[2] The mechanism of the draws for each round is as follows: On 17 July 2014, the UEFA emergency panel ruled that Ukrainian and Russian clubs would not be drawn against each other "until further notice" due to the political unrest between the countries.
[5] The schedule of the knockout phase is as follows (all draws are held at the UEFA headquarters in Nyon, Switzerland).
[1] The draw for the round of 32 was held on 17 August 2018, 14:00 CEST, at the UEFA headquarters in Nyon, Switzerland.
The draw for the round of 16 was held on 1 October 2018, 13:00 CEST, at the UEFA headquarters in Nyon, Switzerland.
The draw for the quarter-finals was held on 9 November 2018, 13:00 CET, at the UEFA headquarters in Nyon, Switzerland.
During the Chelsea - PSG tie a number of arrests were made by the Metropolitan Police of travelling supporters of PSG who were arrested for possession of illegal drugs, weapons and vandalism.
This was after disorder was reported at Waterloo and Wimbledon Train stations and a bus carrying PSG supporters being searched and barred entry to Kingsmeadow Stadium.