Chelsea boss Thomas Tuchel says the feeling of winning is "addictive" as they begin their Champions League title defence against Zenit St Petersburg.
The Blues beat Manchester City 1-0 in last season's final and are unbeaten in five games this season.
Midfielder N'Golo Kante and winger Christian Pulisic will miss Tuesday's game with ankle injuries - but Kante could return to face Tottenham in the Premier League on Sunday.
"Nothing is like belief," said Tuchel.
"I reached the final the season before [with Paris St-Germain, losing to Bayern Munich] and had a feeling it was a big achievement.