https://www.chelseafc.com/en/news/2020/02/10/champions-league-change-of-venue
Champions League change of venue
10 Feb 2021
UEFA has confirmed that Chelsea's Champions League Round of 16 first leg
match away against Atletico Madrid and will now be played at the Arena
Nationala in Bucharest in Romania.
https://i.imgur.com/dYlRLYo.jpg
The date of the match, Tuesday 23 February, and the kick-off (8pm UK time)
will remain the same. The second leg at Stamford Bridge is on Wednesday 17
March at 8pm.