Thomas Tuchel has admitted that the Champions League defeat by Manchester United in 2019 sent him spiralling into two days of darkness and remains the lowest point of his coaching career.
The Chelsea boss was at Paris Saint-Germain when Ole Gunnar Solskjaer's side sensationally overturned a 2-0 first-leg deficit in the last 16.
On Sunday, Tuchel will welcome United to Stamford Bridge for the first time since joining Chelsea.
He said: 'I can be very honest — after that match I was two days in a very dark place, I was not able to speak to anybody and to think about anything else than this defeat.